Cost a lot of effort to paste these two articles, feel worthwhile, with a computer so long also met a lot of hard disk problems, many problems are not returned. I am very sad that the loss of hard disk data is caused by human, such a number of times, there have been a period of time to read this information, previously wanted to do a "data recovery is not complete manual" has never moved, there is no condition to create conditions, such as the conditions are not to do ...
Can the software repair the hard drive? --Full analysis of hard disk damage
Author: Preface to Ming Zhi
This is the author wrote to me a paragraph: "Want to write this article for a long time, the reason has not written, because of the personal responsibility, worry about their own knowledge is not enough, can not comprehensively and objectively judge the facts." Now, after months of searching for information and testing repeatedly, tearing down and damaging dozens of of hard drives, feel that you have enough facts to make judgments, so write this article. Because this is a popular article, for all users and consumers, so do not intend to talk about specific technology and complex theory, only the basic principles and practical results. Hope that through this article, can help the broad masses of DIYer to recognize some facts, for all kinds of advertising and seemingly professional publicity can be independent to make clear judgments. ”
To tell you the truth, this paragraph of the word "" is too much, if the teacher to see the proofreading group, but also to scold me a meal must not. But always feel that these "" "word contains some of the author's emotions inside, so resolutely preserved, so that you can be infected with the same emotions, without fear of being edited clumsy handwriting changed to unrecognizable, lose the original flavor.
In other words, when readers read our magazines, they understand knowledge first and foremost, rather than studying grammar. It is for this reason that in the critical period of the magazine's production, a topic that was already being prepared was removed and temporarily replaced-that is to say, we thought it would bring more gain and shock to the reader. Yes, shocking! This article is not a simple universal knowledge of the article, but the majority of users are generally concerned about the problem of hard disk some disclosure. Why is the hard drive damaged easily? How does the manufacturer deal with the rework hard disk? HDD Repair company How to repair a bad hard drive? Can software really fix a bad hard drive? Look down, you will find the essence of the problem.
The starting point of the dispute
All along, hard drives are the most important storage devices in computer systems, and they are also the most easily faulted parts of computer systems. Over the past more than 10 years, the computer CPU has been running faster than I know how many times, from dozens of MHz up to now more than 3GHz, computing and processing functions has been a few generations of leaps. Other parts, such as graphics cards, the sound card and the optical drive have been replaced many generations, only the hard disk of the most important storage device, although the capacity and speed has been greatly improved, but the basic structure and working principle is still not much change, and due to the speed of the hard disk and the increase in density, hard disk than before more easily damaged In the process of using a typical user, if the hard disk failure, but also within the warranty period, of course, to find the seller to request warranty or replacement; but now most of the IDE hard drive warranty period of only one year, after this time the hard drive out of trouble, you can only consider spending money to repair or buy a new hard drive.
Just spent more than a year or two of the hard drive to throw away, of course, unfortunately, most users also want to spend the least money to make their own computer components to maximize their use. In order to cater to this kind of saving mentality, these two years second-hand hard disk market development quickly, also appeared some to repair hard disk as the selling point of hard disk maintenance company, and there are many said to be able to repair hard disk bad road hard disk maintenance software, such as HDD regenerator, MHDD, PC-3000 and efficiency sources , some of which are advertising their own is professional software, can repair the hard drive of the physical bad road and does not affect the hard drive capacity to sell to more than 10,000 yuan sky-high. Especially when the Russian PC-3000 into China, this information is more attention.
[Note: PC-3000 is a famous Russian hard disk laboratory ACE Laboratory Research and Development of commercial professional repair hard disk integrated tool, it can crack various models of hard disk dedicated CPU instruction set, interpretation of various hard disk firmware (firmware), so as to control the internal work of hard disk, It realizes the call of the internal parameter module of hard disk and the hard disk program module, and finally achieves the purpose of repairing many kinds of hard disk defects with software. In addition, it has a special effect on data recovery, and it is difficult for most OEM hard drive manufacturers to master these features. ACE Laboratory after more than 10 years of continuous research, PC-3000 V12 (latest version) has been able to support most of the new and old models of IDE interface hard disk, capacity from 40MB to 200GB. Its strong repair hard disk function has been recognized by the world's professional hard disk repair company, currently in the world has thousands of professional-level users, is said to be repaired with PC-3000 daily thousands of to tens of thousands of defective hard drives. ]
For ordinary users, if you can really fix a hard drive with a physical bad path, then you can save money to buy a new hard drive; for second-hand hard drive vendors, a bad hard drive and a no bad way price difference is much, if you can turn the bad way into a no bad, you can earn a lot of profits For those who specialize in repairing hard drives, you can use a computer to set up a table with one of these software. An average of 40 yuan per hard drive is also very good business; for the agent that sells these software, each sale one set is 7000~8000 yuan's profit, more is the fat oil spill business. As a result, various groups of people have started a series of campaigns with different aims to make these software more visible, motivated by various forces. As a result, a lot of hard disk maintenance, second-hand hard disk and hard disk technology as the theme of the forum has sparked a large number of discussions and even scold war. Interested readers can go to the "store Online" (http://www.stol.com.cn) forum for a spin.
So, can the software repair the hard drive? To understand this problem, you must first start from the internal structure of the hard drive to understand the cause and mechanism of the hard disk damage.
The structure of the hard disk
Hard drive internal structure
About the hard disk structure of the article has been very much, but really want to make it clear, even if a special book can not finish, so here is no longer from the beginning of the story. Just to be clear, so far, in a lot of articles, technical data and even the textbook of the hard disk structure model, is already a very old hard disk structure. For today's new hard drives, all are not using such a structure, but rather a more complex and more scientific structure.
In older hard drives, the older CHS (CYLINDER/HEAD/SECTOR) structures are used. Because a long time ago, when the capacity of the hard disk was very small, people used the structure similar to the floppy disk production of hard drives. That is, each track of the disk disc has the same number of sectors, resulting in the so-called 3D parameters (disk Geometry), that is, the number of heads (Heads), cylinder number (cylinders), sector number (sectors) and the corresponding 3D addressing mode.
CHS Structure
Where: The number of heads means that the hard disk has a total of several heads, that is, several disks, the maximum is 255 (with 8 bits storage); The number of cylinders indicates that there are several tracks on each side of the disk, up to 1023 (10 bits storage) The number of sectors indicates that there are several sectors per track with a maximum of 63 (stored in 6 bits), and that each sector is 512 bytes in theory, and you can theoretically take any number you like, but it seems that you have not found any value yet.
The maximum disk capacity is:
255X1023X63X512/1048576=8024MB (1m=1048576bytes)
or the common unit of the hard disk manufacturer:
255x1023x63x512/ 1000000=8414MB (1m=1000000bytes)
Because the number of sectors per track is equal in the CHS structure of an older hard disk, the heretics record density is much lower than that of the inner channel, thus wasting a lot of disk space (same as a floppy disk). To further improve the hard disk capacity, now the hard disk manufacturers have to use the same density structure to produce hard drives. This means that the track length of each sector is equal, and the sector of the outer ring track is more than the inner ring track. With this structure, the hard disk no longer has the actual 3D parameters, the addressing mode is also changed to linear addressing, that is, the sector is the unit to address. In order to be compatible with old software that uses 3D addressing (such as software using the Biosint13h interface), vendors typically install an address translator within the hard disk controller that is responsible for translating the old 3D parameters into new linear parameters. This is why the 3D parameters of the hard drive can now have multiple choices (different working modes can correspond to different 3D parameters, such as LBA, LARGE, NORMAL). With the increase of disk density, the further complexity, function and speed of the mechanism, today's hard disk will be divided into a large capacity in the disk, known as the "System reserve" area, used to store the hard disk of various information, parameters and control procedures, Some even put the fireware of the hard disk into the system retention area (the original information is stored in the hard disk control circuit board on the chip). This can further simplify the production process, speed up production and reduce production costs, but on the other hand, but also greatly increase the number of hard disk fatal damage and shorten the life of the hard disk. My 200MB hard drive more than 10 years ago and the 1.2GB hard drive 8 years ago are still very well used, don't say the bad way, even the sound of running is not, but to the later 4.3GB, 6.4GB, 10GB, 20GB hard drive, have not been able to use more than 4 years, all broken off.
Types of hard disk damage
Generally speaking, the damage of hard disk can be divided into hard damage and soft damage by large categories.
Hard damage includes head assembly damage, control circuit damage, comprehensive damage and sector physical damage (commonly known as physical bad Road) four kinds.
※ The head component is damaged: mainly refers to a part of the head assembly of the hard disk is damaged, causing some or all of the heads can not read and write. There are many ways and possibilities of the head assembly damage, including the head dirty, the head wear, the head cantilever deformation, the magnetic coil damage, displacement and so on.
※ Control circuit Damage: Refers to the hard disk in the electronic circuit board of a part of the circuit breaker or short circuit, or some electrical components or IC chip damage, etc., resulting in the hard drive after the disc can not normal start, or after the turn of the head can not be properly searched.
※ Comprehensive damage: mainly refers to the various problems caused by the hard drive due to some slight changes. Some are the hard drive in the course of use because of heat or other relationship caused some of the chip aging, some of the hard drive after the shock, the shell or disk or motor spindle produced a small change or displacement, some of the hard disk itself in the design of heat, friction or structural defects. All kinds of reasons lead to hard disk instability, often lost data or logic errors, work noise, read and write speed, sometimes normal work but sometimes not normal work.
※ Sector physical damage: Because of collisions, head friction or other causes of the disk surface of the physical damage, such as scratches, drop magnetic and so on.
Soft damage includes track servo information error, System Information area error and Sector logic error (commonly referred to as logical bad way).
※ Track Servo information error: It means that the physical track can not be accessed because of damage or failure of the servo information of a physical track.
※ System Information Area error: Refers to the system Information area of the hard disk (a system reserved area inside the hard disk, the inside is divided into several modules, save a lot of hard drive factory parameters, settings information and internal control procedures, in the power self-test can not read the information of certain modules or calibration is not normal, resulting in the hard drive is not ready to enter the state.
※ Sector logic Error: It is due to checksum error (ECC error and CRC error), Sector flag error (IDNF error), Address information error (AMNF error), bad block marking error (BBM) and other reasons that the sector failed.
In general, repair hard disk soft damage is possible, many hard disk manufacturers release of hard disk Management and maintenance software (DM) have the ability to repair soft damage to the hard disk. Such problems as sector logic errors, even the general low-level format software, can be fully qualified. But in the midst of all the soft damage, System Information area error is more difficult to repair the kind, because even the same manufacturer of the same model of hard disk, the System Information area is not necessarily the same, and the hard disk manufacturers for their products of the system Information area content and read instruction code, generally is not public. But for IBM and Hitachi hard disk users are more fortunate, Hitachi's DFT and IBM's DDD-SI software on the System Information area error or have a relatively high rate of repair success. These two software are really hard to be released by the manufacturer of hard disk maintenance software AH (DFT or free), it has a very powerful function, efficiency and reliability is much higher than the software written by the third party who asked for it, but it is only valid for IBM and Hitachi products.
Of course, if only in order to repair the soft damage, a original DM software can complete more than 90% of the task, do not need to buy tens of thousands of so-called professional software, and now HDD regenerator, MHDD, PC-3000 and efficiency sources and so on these software, In the publicity on the show that they are not only for soft damage, and even hard damage inside the physical bad way even some IC damage can be repaired!
It cannot be said that their propaganda is exaggerated, because theoretically it is possible. If our hard drive in the warranty period is broken, to the manufacturers, they will also have to repair the hard drive. Then, we are now very necessary to understand the manufacturer of hard disk maintenance methods and procedures to see how the manufacturers are maintenance, and pure software maintenance is not any different.
The method of repairing hard disk by factory
Here we can tell you a little bit, even from the factory out of the new hard disk, their platters are not a bit defective or not. Because the disk is more sophisticated disc, for the production environment and mobility are very high requirements, even a speck of dust, a very small collision, will produce from several to hundreds of bad sectors. So, in general, it is not impossible to have a new platter with thousands of bad sectors, according to the current 120GB capacity of the hard drive. But the hard disk manufacturer will use specialized equipment to scan the platters, record the bad sectors and the unstable sectors of the magnetic media, make a hard disk defect list, write into the system retention area, and close the sectors through the control program, while the hard drive control program will not read these areas when reading the hard drive. Today's hard drives are much more information written into the system's retention area because of the complexity of their functions and parameters. In this way, because the level of the underlying control has been the problem of the sector has been closed, so users no matter what format and zoning software will not see this part of the information, it looks like a really completely no bad way. At the same time, there is another closed area in the hard disk, also known as reserve capacity, they are actually a good disk without problems, but for some reason to be closed up. For example, a hard disk is 60GB, and the disc capacity of the disc is 40GB, then the hard disk consisting of two disks must be closed down 20GB capacity (disk production line is certain, manufacturers to reduce costs, will only produce a capacity of the disk, To obtain different actual hard disk capacity by enclosing different capacity areas.
Figuring out how the hard drive works, then how the manufacturer repairs the hard drive is well understood. For the control circuit, the magnetic first class damage, is the application of the simplest substitution method, replace the new parts can be. For IC chip damage, you can rewrite the IC chip information or simply replace the IC chip to repair. For disk platters, the situation is more complex. First, the manufacturer will use the special equipment to the hard disk surface according to the actual physical address of the full scan again, check out all bad, unstable sectors, form a new hard disk defect list, and then write it into the System Information area of the hard drive, replacing the old HDD defect list. The internal low-level formatter is then invoked to internally format the hard disk. According to the new System Information Area information, the program will renumber all the tracks and sectors, clear zero, rewrite the track servo information and sector information. After this process, the repaired hard disk can be the same as the new hard disk.
Someone might have a question--now that there's a new bad sector added to the system reservation,
So, is not the repair of the hard disk and the new hard disk is completely different? There's a technology problem here--the difference between the introversion and the divergence of the damage, and I'm going to stay behind and say, "Here's how the Third-party software fixes the hard drive."
The principle of the third party software repair
We are talking about Third-party software repair hard drives, the main discussion is to repair the physical damage to the hard disk sector-the logical bad way there is no good to discuss, repair is not difficult. At present, third party software repair hard disk sector physical damage generally has two main ways: reverse magnetization and modify the hard disk defect list.
Reverse magnetization is one of the first to be used to repair the physical damage to the hard disk sector. Generally, the head of a hard disk is only responsible for reading and writing signals, while the level signal required to read and write data signals is not the same as the magnetic media itself on the disk surface. And the reverse magnetization is through the use of software instructions to force the head generated in the magnetic medium itself, the corresponding high and low level signal, through multiple reciprocating movement to damage or loss of magnetic sector of the repeated magnetic, so that these sectors of magnetic media regain magnetic capacity. HDD Regenerator is the first software to use this way, and then some software by analyzing its algorithm and instructions, but also mastered the reverse magnetization signal, using the same or similar to the engine for reverse magnetization. Should be noted that there are many so-called professional HDD repair company released some claims can repair hard drive bad way software, generally also want to 300 yuan, in fact they just through the ultra edit, PCTools and other binary editing tools on the HDD Regenerator interface information to rewrite, or to the HDD regenerator shelling, replaced by their own written shell interface. The plain thing is pirated HDD regenerator, so please be sure to distinguish between them. The biggest disadvantage of the reverse magnetization is the slow speed of a magnetic medium instability or loss of magnetic capacity of the sector to magnetization, the head is likely to be repeated hundreds of times, if the hard disk is only dozens of or hundreds of bad sectors, slowly boil is also possible. But today's hard drives are hundreds of gigabytes of capacity, there are tens of thousands of bad sectors is also very common things, this time if the method to repair, probably not repaired to 10%, the head will be due to fatigue over deformation, the original through the hidden partition can also be used after the hard drive will be completely scrapped. And these sectors of the magnetic medium itself is unstable, even if magnetized, in a period of time can be used, but at any time there is the danger of losing the magnetic capacity, hard drive is not stable. At the same time, this method does not repair the physical scratches this hard damage.
The way to modify the hard disk defect list is to improve the reverse magnetization, which is very similar to the way the HDD manufacturer repairs the above mentioned method. As I said before, the hard disk manufacturers for their own hard disk products, the System Information content and read the instruction code, is generally not public, but some technical personnel through analysis and reverse engineering, cracked the manufacturer's directive code even fireware, so that they can develop program software, free to read, Information about modifying and writing to the hard drive system Information area. In this way, they can also, like the hard disk manufacturer, write programs to scan the disk surface by physical address, reconstruct the new defect sector list into the system reservation to replace the original list. After such a software maintenance of the hard drive, in theory, with the hard disk manufacturers to repair the hard drive is no difference. This kind of software because of this function, so the price is very expensive, PC-3000 to tens of thousands of yuan, efficiency Source Professional Edition (retail version can only fix ECC error and CRC error, in fact, nothing can do) also want more than 600, and they are not included in the future upgrade technical support, Because these software have a very fatal weakness-after all, they are by cracking the data obtained, to some extent, illegal. Different hard disk vendors, even the same manufacturer of different models of hard drives, for the system to retain the control code are different, Fireware also differ, in order to make the software universal, they must continue to crack the new hard disk model to enable the software to support more hard drives. And if you buy a set of software that they are going to continue to give upgrades support, they are absolutely not, in order to repair more new hard disk models, you have to continue to pay the upgrade costs. On the other hand, on the hard drive of the system Information area, if the cracked well can also, if the crack is not good, the information modified to write in the future, light will make the hard drive in the read and write frequently error, unstable; Heavy will be reimbursed the hard drive.
The final analysis
I have mentioned before, in fact, the repair plate and a new hard disk or there is a difference, so where is the difference? Very simply, in the new hard drive, the physical damage to the sector is generated during the production process, and the hard disk that needs to be repaired, the sector physical damage is generated during the use process. Different physical damage creates an environment that directly affects the destructive size of the damage.
In order to illustrate this issue, I give an example of electroplating process, although not necessarily the case, but this is indeed the category of materials science and technology, even if the disk surface processing can not escape this range. If the plating process for some reason, resulting in some place coating too thin or not plated at all, then this part is defective part, it will easily oxidize rust. This part of the rust will spread and extend to the original plated well, there is no defective part, but this process is very slow, because this flaw is in the production process with the coating formed at the same time, the edge of the coating is also closed very well, so the defect is introverted, it spread and expansion will be slower. And if the original coating is intact, then you use a knife to scrape a part of the coating, then there is a divergence of defects. Because in this flaw, you not only destroy the coating on the surface of the defect, but also the edges of the coating on the intact part are destroyed. In this flaw, oxidation rust spreads and expands very quickly and can soon produce a large area of oxidized rust in the intact part.
The hard disk disc production principle is the same. As we all know, bad sectors can spread, and even if they are closed, they will spread on the surface of the disk without reading or writing. A bad sector formed during the production process, the surrounding magnetic medium crystals are still homogeneous and dense, and the physical properties are still fairly stable, and in such an environment, the spread of bad sectors is a very slow process, I am afraid, even if the hard disk life to it has not spread out how far. And in the course of use because of collisions, the bad sector that is scratched, the surrounding magnetic medium crystals are in a broken and loose state, so that the bad sector spreads very quickly, and it is likely that you have just closed it soon, and it will spread to the intact area without closure. As a result of this potential instability, in North America, the general repair of the hard drive will be a rework label, with a very cheap price to sell (about 1/2 to 1/3 of the market), and even some companies simply take the repair plate to Asia or some third world countries to sell the market.
For the hard drive that has been repaired, repaired by the hard disk manufacturer and to the outside maintenance personnel through the software repair, although theoretically is based on the same principle, but the actual effect is still different. Software repair requires that the head of the hard disk continuously read and write each sector to determine if the sector is really losing its magnetic capacity, and that the process may be repeated hundreds or even more. So that each sector is constantly reading and writing, take a very long time, such as MHDD, under the default parameters, a random scan of a 3.2GB hard drive, it will probably take 48 hours or even 5 days (depending on the bad disk situation, time is very different), and must continuously work uninterrupted. This to the hard disk head and plate itself damage is very large, is already not a good disk, and then after such a toss, even if it is repaired, you dare to put some useful data?
If the hard disk manufacturers repair, they will use a special machine, those machines using optical principle to the disc surface error (details more ingenious, not to say, physical or electronic professional friends should know), rather than using the head to really read and write the disc surface. In this machine, when different kinds of sectors--intact and defective: such as disc scratches, magnetic media impurities, magnetic porosity, magnetic properties and so on, through the detection point, will produce different feedback light signals, the machine will be based on the feedback of the light signal records of all defective sector records and corresponding sector location, A list of hard disk defects is compiled. Because not through the physical magnetic head read and write, so not only scan the speed of fast, but also on the disk damage to the disc is much smaller.
Conclusions and some superfluous words
Is it possible for us to draw some conclusions here? Conclusion I will not say, you readers should be able to make their own judgments. I have no doubt that those who write these hard disk maintenance tools are geniuses, and even people who crack the engine of others are also geniuses, but all things have their own objective laws, not to some people over the propaganda and will of the transfer. Software can achieve a lot of functions, but similarly, there are some functions they can not, and can not be achieved, the world has not been able to cure all diseases of the elixir, the software is the same.
Now the price of hard disk is getting cheaper, 80GB hard disk as long as 600 yuan, the design of the service life is about 3 years or so. To be honest, if you repair a 20GB hard drive to 100 yuan or buy a second-hand 20GB hard drive to more than 150 yuan, then I simply buy a new forget-even if repaired the hard drive or bought a second-hand hard drive, is also absolutely not trust to use this disk to store important data.
But I also do not completely exclude second-hand hard drives, after all, they are relatively cheap, for some do not need a lot of capacity, only need basic functions and uses of users is also a good choice. At present, the domestic second-hand market is the most developed than Guangzhou (limited to discuss the normal channels, some of the abnormal channels are very developed, but not the scope of this discussion, Panyu is second-hand computer parts and peripherals, the largest distribution center, many of the mainland second-hand hard drive vendors are through the channels of Canton and then sent to the mainland. For a single retail merchant, the daily volume of second-hand hard drives is a few, more than 10. But for the second-hand hard drive wholesalers, the daily turnover and unit prices are not calculated by one, but in tons. In Panyu, an ordinary wholesale store, the average daily turnover may be hundreds of or even thousands of hard drives. According to this volume, they should be unlikely to have the time to use software to scan and repair the hard drive. At the same time, you may not know how they are used to foreign computer spare parts or the whole machine, I can simply say. In developed countries, the elimination of computers are not allowed to throw into the dustbin, the way people or neighbors see the alarm will be fined a lot of money. As a result, people who buy second-hand computers or spare parts in foreign countries do not have to pay any fees, whereas companies and individuals who need to eliminate computers must pay a considerable fee to those who receive the computer to pull the computer away. Because of this, the old computer in foreign countries can be said to be no business, plus the freight of each container is about 1000 dollars (now the country does not allow imports of garbage, but a lot of second-hand computer accessories can still come in, plus the business people always have many ways, And can be through a variety of customs documents to the way to get rid of import duties, so the domestic purchase price is the low you absolutely can not imagine. Domestic hard drive wholesalers are used to unload a car and a car pulled back, crashed the car fell to the ground. Because their wholesale prices are already very low, do not care about the breakage rate, do not need to pay attention to the hard drive will result in bad track and disk deformation, just need to quickly ship, and then quickly purchase. So here I can tell you very responsibly that almost 100% of the hard drives coming in through this channel have such or such flaws, if they are purchased from a local company or a person who has been eliminated from the machine. All over the dealers will be wholesale to the hard drive to simply repair before the retail store, from this, we can know that the need for this kind of software is mostly middlemen and retail merchants, they used a lower price in a number of second-hand hard disk, but the amount of daily shipments, if you can put the hard drive of the bad way all shielded up, Return to the seemingly no bad way, then the same hard drive retail price can increase 50 to 100 yuan. Such a dish is of course also available, but everyone needs to decide whether to buy and use the hard drives according to their actual use and the importance of the data. However, I believe that the bigHome should be able to start from their actual needs, decide how to spend their own money.
By the way, someone might hesitate to buy a new hard drive because he or she is using an older computer model and cannot identify a large hard drive. Then I can say please rest assured that even what hard disk manufacturer's large hard drive support program is not required. If your motherboard BIOS is award, then you only need to download a small program called BP (full name BIOS patcher, you can modify the motherboard BIOS program error, open the Blocked function; currently only supports the award BIOS.) Download Address: Http://rom.by/Award/patcher/bp-4rc_C.rar, assuming that your motherboard BIOS file name is 1.bin, then you enter the command in pure DOS mode: BP 1.bin, and then brush the file back to the motherboard, everything is done. Now, no matter how old your motherboard is (even the old Ben, VX motherboard), it can support a large hard drive of 137GB.
Goodbye hard and soft damage-HDD repair and data recovery
Author: naruto
Published the software to repair the hard drive? Hard disk damage Analysis "after a article, produced a lot of repercussions." I collected a number of channels through a variety of responses and opinions, many consumers are through this article only to hear the first time such things and the insider, very supportive of such articles. Of course, a variety of reactions inside also have some critics of the industry, that such an article on the development of the industry is unfavorable. However, I think the Shing and information blockade is the biggest disadvantage to the development of the hard disk and data industry; Let us know more about this information, from the overall increase in the level of awareness of the industry, it is really conducive to the domestic hard disk maintenance and data recovery industry level of improvement. It is based on this idea, so there is a follow-up article. Because the object is still the ordinary DIYer and the vast consumer, therefore still uses the more popular narration way, avoids the use excessively specialized vocabulary and the advanced so-called "The theory knowledge" as far as possible.
It is also important to note that the specific structure and rationale of the IDE hard disk and SCSI hard disk are different, and SCSI hard drives are much more complex than IDE hard drives. Based on this article is only for the purpose of popularization, in order to describe the simple, the hard disk described in this paper refers to the IDE hard disk.
The reality of the hard disk market
In the previous topic, I just briefly described the hard disk maintenance of some knowledge and conditions, there is a need for the hard disk industry and the market for a more in-depth explanation, in order to enable readers to read and understand the next part.
People with experience in computer use for 8-10 years or more will have a profound experience. D? D now the quality of the hard drive is getting worse. In retrospect, the former 600MB, 1GB, 1.2GB, 2.1GB era, a lot of hard disk with the current hard disk compared to the only lack of capacity is not so large, speed is not so fast, but in the actual use of many other aspects of those hard drives than the current hard drive to be better. For example, the noise is very small, even almost to the ear on the body to hear the hard drive to turn the sound; Long service life, I a friend of the home of an IBM original 486DX33 computer, the inside of the 200MB hard drive is still in normal use, no noise, no bad, seek time can still reach the nominal value , performance is not any drop; the disc body quality is good, I can collect from 200MB to 2.1GB hard drive out, found that those hard disk most of the disk body still shiny, rugged, without any oxidation, rust and traces, Starting with the 3.2GB, the hard disk body, which is more than 3 years or more, has been tarnished can even gently shake out the sound of the circuit board materials, the following two pictures, Seagate 3.2GB hard disk circuit board is a big plate, Kun teng 15GB hard disk is splines circuit board, compared to the work of the Board and the above electronic components are very able to explain the problem. Why is this happening?
There are many reasons for this, and it is impossible to explain it in an article. For hard disk durability Change this point, the manufacturer's argument is that the speed of the hard drive, data density increase, power consumption, heating more, so the life shortened. The media is that the overall profit margin of the hard disk industry is declining, competition is increasingly fierce, hard disk manufacturers in order to enhance competitiveness, must take measures to effectively reduce product costs. These statements certainly have their reasons, but I do not want to discuss these commonplace questions here today, I would like to say a personal experience of things as an example? D? D This is only the hard disk manufacturers face a small number of problems, of course, not enough to constitute a manufacturer to take substantive action, but under the comprehensive effect of a variety of problems, the situation is different. I have an old American friend, because not convenient to say name, I temporarily call him dick, in a hard drive manufacturer. One year he ran to Canada on his annual leave, forcing me to let him sleep on the couch for two days at my house. One day, chatting about the company's bad things, he immediately complained, said: "Jack (for the time being called himself), you Chinese people give me a headache." "I am very strange to ask him why he said so, he explained for half a day, I understand that the company's hard disk that period of time suddenly in the Chinese market reworks straight up, to the company's Quality Assurance department is very big pressure, also make the company's after-sales service costs greatly exceeded the budget. The company immediately sent someone to understand, the conclusion is that although the company is prepared to set up factories abroad, in the production of a certain adjustment, resulting in some models of product quality fluctuations, but this does not constitute a sudden rise in the Chinese market reworks the main reason. The main reason is that they offer a 3-year warranty, many users in a number of publicity to know that some models of this brand some problems, the goal is extended to a full range of products, even if their own hard drive has been no matter, but still in 2 to 2.5 of the time to run to the dealer there to ask for a plate. In order to achieve the purpose of exchanging, many consumers use the bad means? D? D use a towel to wrap the hard drive, after power-on the hard drive to the desktop or hit with a hammer, or use some of their own or ready-made small programs, issued some instructions, so that the hard disk head frantically rocking back and forth, in a short period of time causing the head of the cantilever deformation and disk surface production of physical strokes. It is precisely because of this reason that the company's products in the Chinese market exchange and reworks greatly increased (to know, generally, at that time their company's hard drive reworks is less than 1 per thousand, even if the 2 per thousand has exceeded many times, not to mention they were higher than this). The company asked him to work out the problem, and he learned and studied, knowing that other companies faced the same problems, but their companies were more serious because they had a high market share in China. Way to think, he said that you can change the design of the hard drive, so that when the hard drive returns, they can through special means to find out whether the hard drive is natural damage or abnormal damage. But the company was dismissive of his approach, because theThe idea is good, but there is no practical feasibility. D? D The return process is usually the behavior between the consumer and the distributor, and dealers do not have such a means of verification, such as hard disk collection to the company's time is too late, and even if the company knew the cause of the hard disk damage, there is no direct evidence to refuse to return, further, even if there is evidence, it is still impossible to refuse after-sales service, Lest be hyped by rivals, offend all consumers. It is for this reason that he is holding his breath!
Of course, we now know how hard disk manufacturers solve this problem? D? D while taking such measures is also based on a global environment. At that time the competition is fierce, hard drive profit space continues to drop, if the manufacturers at the same time to bear such a heavy after-sales service, there is no profit at all to speak of. So the way they solve it is surprisingly consistent? D? D reduce the cost of products and shorten the warranty period in order to maintain a considerable profit. Here, I do not know what to say good, a small number of consumers selfish bad behavior, damaging the interests of all consumers, most of the other law-abiding consumers to be buried with them. I definitely do not want to preach to let everyone run to exchange, because this will only lead to the market into a vicious circle, a few people will be returned because it seems to be cheap and chuckle, but ultimately the damage is their own, but also to lose the others did not do so. [Pophard: I hope everyone can abide by the rules of the game of the industry, so that the market is a benign cycle of development, we can enjoy a good after-sales service, can also use more high-quality products.
Of course, in a call to reduce costs, there are some manufacturers run too far away from the normal track. The most obvious problem is the handling of the servo port. Friends who are familiar with the hard drive know that there is a hole on the hard disk, generally with aluminum paste cellophane live, and some even with metal sheets wrapped in sealed stickers to prevent it from being destroyed, this is the servo port (some sales staff call this is a vacuum seal, is actually wrong, the hard drive is not a vacuum inside, The head is suspended above the disc by the air cushion principle to read the data. The effect of this seal is to prevent the dust from getting inside the hard drive, so the correct argument should be? D? D Hard drive interior is dust-free. Generally speaking, the disk structure of the track is not in the Assembly before, think of all know that 3-inch platters to store dozens of GB of data, the track must be very close to do. If you build a track before you assemble it, a very small error in the assembly can cause one or the other problems in the work of the assembled hard drive. At the same time, there may be a slight collision in the assembly process, resulting in bad sectors, if the construction of the track before the assembly, it is impossible to find these bad sectors to be shielded. And the role of the servo port, after assembling the hard drive, the manipulator can extend from this hole to carry on the scanning and writes the servo information, constructs the track, thus, only needs the hard disk to carry on the scanning and the writing process can complete the servo information writing, but can guarantee the servo information accurate and the hard disk product reliability maximally. The number of servers can be one, 2, 3, or more. Single-sided disk only need 1 servo, single sided need 2, double 3 side is 2, double piece on the four sides is 3, so on.
The servo port is not broken, once damaged, the dust in the air will enter the hard drive inside. For disks, a speck of dust is the equivalent of a bomb. Even if only a speck of dust goes in, on the high speed spinning platter, the dust will jump like a pinball, constantly hitting the disc, forming a bad sector big and small. Therefore, the hard disk manufacturer for such a hard drive is not repaired. You can see that on the server on the sticker, there will be such a description? D? Dwarranty Void If Remove (once damaged, warranty failure). But it is in this disk body most important, is also the most fragile place, a hard disk manufacturer intentionally or unintentionally appeared the more serious design mistake. As shown in the figure, some hard disk manufacturers to protect the material of the servo port, in addition to not enough depression, the protection of the hard drive inside the absolute dust-free working environment is a 15mmx8mm, thick less than 0.1mm of small pieces of paper (really is a piece of cardboard)! As long as a careless scratch this thin paper, the entire hard drive will be completely scrapped. People with a little DIY knowledge should know the hard drive installation process, to put the hard drive into the hard drive rack, its side and rack a bit of friction is very normal, and this place is to take the hard drive when the finger is the most easy to poke the place, not enough sag and the paper exposed in this position that is simply playing with fire. If any of the hard drive manufacturers in many customers because of accidentally scraping the paper caused by the hard drive scrapped, refused to provide customers with three packs of services, and to let customers to pay for their design mistakes, it is a bit too much.
It is because of the low cost of manufacturers to pursue, so that although there has been a long time, but has not been enough space to develop the industry has been waiting for a long time to develop, this is the hard disk maintenance industry. Because if the hard drive can always be very stable to use a relatively long time, then for users, no bad repair, with a six or seven years of the word even if the broken is not necessary to repair. But now the situation is a little different, many hard drives just after the warranty period soon bad is very common things, and spend 1000 or hundreds of yuan hard disk bought two years to throw words I am afraid who will not willingly, which caused the hard disk repair market demand.
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
