Explain the knowledge about U disk capacity

about the volume of U disk knowledge, in fact, there is not much to talk about, after all, we are more understanding, but to fully understand the volume of u disk knowledge, it also needs to pass the contrast, we can draw more content. The following small series on the case to illustrate, to group the main control Kingston DTSE9 16G For example, the use of the test tool chip worry-free, group of master detection Tools GetInfo.

New non-mass production chip test screenshot

The test screenshot of the amount of postpartum chip without worry

From the above, we can find that the quantity of the device serial number, firmware version and firmware date has changed.

Now let's look at the GetInfo test:

Information test screenshot of quantity prenatal GetInfo

Volume postpartum getinfo Information test screenshot

Amount of postpartum getinfo other test screenshot

A screenshot of the quantity prenatal GetInfo Partition setting test

Test screenshot of the quantity of prenatal GetInfo

Quantity of postpartum getinfo Partition setting test screenshot

From the test screenshot above we can see that the following parameters are reversed (other unspecified parameters have no effect on capacity):

INFORMATIONFW (firmware version and date) MP Ver (mass production tool)

Partition settingtotal Capaci (Total capacity) fat size (FAT)

Otherid_blk Ver

After our repeated mass production tests and comparisons, found that the above parameters change will affect the capacity of U disk, of which the FW and MP ver most obvious impact, the other U disk format (see chip worry-free test 19nm) on U disk capacity also have influence, different standard u disk in front of all the same parameters, There will be a difference of 10 trillion in capacity. Because there is no different standard in the hands of the U disk, so do not give a screenshot.

The above information is the same as a U disk with the same master control, flash memory particles, flash identification code, flash model, Flash type and page, and so on the test, the main control mentioned above, flash particles, flash models and so on parameters, a little bit different, directly affect the actual capacity of U disk. Many customers are very puzzled, why in the same shop to buy different models of u disk, the same nominal capacity of U disk, plug into the computer display capacity will be different, this reason is because of U disk chip information decided.

In addition to the above reasons will lead to U disk capacity is different, in fact, we do not see factors, but what caused the actual volume of u disk less so much?

A little bit to know about the U disk is the use of life, U disk in the erase process will produce bad block, write bad block u disk is not automatic shielding, but he will automatically replace, but the replacement of the block from where? That's the size of your poor. If you buy a 16G USB drive, capacity is just 16G, then there are 3 reasons why you can explain: 1, you have purchased the downgrade chip Flash; The downgrade chip is used by the original 32G recycled flash memory through the mass production of bad block shielding, generally can be normal use of 2, expansion u disk; Expansion as the name implies is to increase the capacity of U disk, the 2G expansion to 4g,8g,16g or even greater, this is the common tricks of profiteers, stored in the file is not used; 3, black film Flash, black film is the chip factory selected obsolete defective, not hit the factory standard, and chip model of the chip. So, when you buy a U disk just good and nominal capacity, do not be happy too early, immediately use the most stupid is the most effective way to verify the storage file is valid, the U disk loaded, and then copy out to see if there is a write error! This is the most effective! Do not easily believe the results of detection tool detection. When it comes to U disk life, many people are worried about the problem of the scratch life of TLC Flash, the current data on the Internet to erase the number of times is 3 years ago, with the current process technology does not need to worry about this problem, at present, we found that only TLC read and write speed is relatively slow, some of the speed of TLC has exceeded the speed of MLC. Today's manufacturers are using TLC, or even SSD, to use the TLC Flash.

Genuine licensed U disk in general, the capacity range is as follows:

U disk capacity and less is not important, it is important to store data security, can not complete the preservation of U disk data, and then a large volume of u disk is also scrap. We buy u disk when you do not cheap, to believe that a penny, not a business will lose money to you, buy a U disk can be compared with the prices of large shopping malls, do not compare with the lowest price of Taobao.

Small explanation, many users in the process of using a U disk copy larger than 4G of a single file, please convert U disk into NTFS format, conversion method "Start-run-cmd-input convert?:/ Fs:ntfs? = your USB drive letter.

about the volume of u disk Knowledge through the above comprehensive interpretation of the complete, through in-depth comparison you have found that usually did not notice some places? U disk capacity of the knowledge to say simple also simple, difficult to say, interested friends, can dig some deeper things, this also requires everyone's wisdom.

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