Several problems should be paid attention to when purchasing hard disk

Many users in the purchase of hard disk, often do not like to buy the CPU, motherboards, memory and other products, serious reference comparison, that as long as the capacity sufficient enough, it can be. In fact, although the capacity of the hard disk is very important, but other parameters can not be ignored. In addition to capacity, the hard disk's cache, interface type and the size of the single disk capacity, the performance of the hard drive also has a direct impact.

Many users in the purchase of hard disk, often do not like to buy the CPU, motherboards, memory and other products, serious reference comparison, that as long as the capacity sufficient enough, it can be. In fact, although the capacity of the hard disk is very important, but other parameters can not be ignored. In addition to capacity, the hard disk's cache, interface type and the size of the single disk capacity, the performance of the hard drive also has a direct impact. At present, the mainstream hard disk capacity of 160GB and 250GB, with the wide use of vertical recording technology, hard disk capacity has increased, the world's largest single disk capacity reached 1TB, and 400GB and 320GB, such as large capacity has been in the market everywhere, 320GB product market has been quite mature, The price is also very reasonable. (currently on the market, the minimum capacity of hard disk 80GB, the average single GB price of about 4.5 yuan, and 320GB capacity of the hard disk, its single GB price of about 2.4 yuan.) Then, small series from a few major keywords to start, to introduce some hard drive to buy the necessary knowledge, and focus on recommending several current hot products, hope to be able to bring some convenience to friends.

SATA-2.5

Mention SATA hard Drive, I believe we are not unfamiliar. Although most of the hard drives in the market now use SATA interfaces, the standards used are different.

What is the SATA2.5 specification? Of all SATA hard drives, the first to launch SATA products is Seagate, as early as 2003 Seagate first launched its SATA products to the market. And always want to maintain their leading position in the industry Seagate is in October 2005 released its new generation of SATA2.5 specifications of products, its single disc capacity reached 160GB Barracuda7200.9 hard disk products. Now more than 7200.10 of its latest vertical recording technology has been put into the market. From the current point of view, Seagate should be the most mature in product technology, and its research and development, such as the strength of other hard disk manufacturers are difficult to catch up with its hard disk industry "World King" title.

So what is the SATA2.5 specification? The SATA2.5 specification was first proposed by Seagate in October 2005. To keep the SATA standard healthy, Sata-i finally decided to put the "Sataⅱ" and "SATA2.0" aside and announced the SATA2.5 version specification in the IDF in 2005. This is more detailed on the 52 hardware 52hardware.com.

SATA2.5 specification in fact and SATA2.0 and there is no speed above the difference, there is no technology above the leap, just a set of norms. This includes a sata1.0a and six SATA2.0 extension criteria. The SATA2.5 standard inherits most of the functionality from the original SATA2, such as the data transfer rate 3gb/s, NCQ, and so on, in addition to staggered-start (staggeredspin-up), hot-swappable (HotPlug), Port-multiplexing (Portmultiplier) and other functions such as the external SATA Interface (ESATA), which was passed recently. Soon after the specification was established, Hitachi launched its first hard drive to meet this standard: MHT2080BH, and Seagate also launched a Barracuda7200.9 hard drive that meets this standard.

Vertical recording is the same as the development of CPU process, the vertical recording technology of the storage industry is beginning to close to its physical limit. In order to have a larger breakthrough in capacity, after the launch of the SATA2.5 hard drive, many hard disk manufacturers to the next generation of hard disk products to the use of vertical recording technology products. So what is vertical recording?

A vertical record is a change in the alignment of the vertically recorded disks, from the disc surface balance to the surface perpendicular to the disc, which can only be placed in a magnetic field (then a data bit) in the space, placing more vertical magnetic field, you can easily at the same bit interval in the data access bit density increase, The advent of the hyper-paramagnetic limit is further delayed.

At present, Hitachi, Seagate, Toshiba, Fujitsu and other companies have introduced its vertical recording technology to the hard disk. Among them, Seagate's cool fish 7200.10 is the world's first successful mass production, and the use of vertical recording technology desktop hard disk. Toshiba's drive to use vertical recording technology, which focuses on a 1.8-inch notebook hard drive, has released a 100GB-capacity 1.8-inch hard drive, which is scheduled to come into production next January.

At present, the SATA2.5 specifications of the hard drive has been fully popularized, we should pay special attention when buying. Since the vertical recording technology has not been fully popularized, the purchase can be temporarily ignored. However, there are a lot of parameters, we need to pay enough attention when buying.

Cache capacity hard disk cache some of the two-level cache of the processor, the larger the capacity, the faster the efficiency, the more performance. In the IDE interface PATA hard disk, the memory capacity is generally 2M, of course, there are 8 m cache products, such as the western data of the JB series. SATA serial hard disk cache capacity is fully upgraded to 8M, many 250GB above the large capacity of the cache capacity reached 16M, but expensive, and rare, so everyone in the purchase of hard disk attention to observe, generally in the disk or box on the logo.

The disc capacity of the hard disk with the development of technology, the disk capacity of hard disks is more and more large. Seagate, Western data and other hard disk manufacturers have launched a single disc capacity of 160GB products, and Seagate recently launched the Cool Fish 7200.10 series of the single disk capacity is reached 188GB. Large single disc capacity can reduce the hard disk head in each disc to find data time, thus also greatly improve the hard disk read and write speed. Production costs can also be well controlled, which is why the recent listing of the single disc capacity of large-capacity products more than the generation of a reason.

The quality assurance of the hard disk, this is a problem that almost all people have to consider when buying things. Hard work is always running at a high speed, and the hard drive is actually very fragile things, no one wants all of their important data easily to ashes. In the domestic, for the hard disk after-sales service and quality assurance in this respect, each manufacturer is also good, especially the boxed brands also provide consumers with three or five years of quality assurance, but remember that: do not buy parallel hard disk.

On the quality of the major hard disk manufacturers, generally have the following situations: One is bulk products, in general, only one year of warranty service, the market in Seagate, Western data bulk products. One is to provide three-year warranty products, Hitachi and Samsung products are mainly boxed products. There is also a five-year warranty service for the boxed products, mainly to Seagate, the first three years known as the domestic quality assurance, and then the two-year warranty to the production of maintenance. Special attention needs to be paid to: regardless of the quality of the warranty, in the warranty period, if the hard disk damage, then only the same capacity to replace the same model of products (not new), and hard disk data vendors are not providing any services, so we usually have to do a backup, the important data burning into disk preservation.