U disk is a good thing, a good helper in life. With the advancement of technology, high-speed large-capacity U- disc gradually walks down the altar, the price is getting lower and lower, and gradually moves toward the hands of civilian consumers. A few days ago, a student spent 40 RMB yuan to buy a 128G U disk in a treasure, yes, not 998, not 499, not 399, as long as 40 dollars, a large-capacity U dribbling home, you Can not afford to lose, can not buy fooled. When I sent it to my hand and tried it for me, I sighed.
Sure, Sham Shui Po!
This is the protagonist of today
As you can see, there is no logo on the USB flash drive.
Plugged into the computer, with a clear prompt, the USB drive letter pops up on the Explorer .
Well, 124G is available. This is normal. Click on the attribute, did not find any flash chip OEM information.
The whole is a three no product!
Here, by the way, why does the usable capacity of U disk always reach the nominal capacity? This mainly involves the problem of the system. U disk manufacturers mainly in decimal system, that is, 1000M = 1G , and the computer is binary, ie 1024M = 1G . This does not seem to be much worse, 1G is only 24M gap, but if the nominal capacity is large, this gap is obvious. There is the U disk itself has some driver files and the like, to take up a little space. So, we hand this 128G 124G U disk appears as available.
Do not think that here 124G is 124G!
start testing. (The yellow block in the figure is written but not verified)
There are many test tools here. The tools used by the author in this test are randomly found on Baidu, and everyone can also use the U disk authentication tools produced by 360 or Jinshan, etc. , which are very convenient. Students with pure obsessive-compulsive disorder can also conduct manual tests, copy large files directly, and then verify the files. (Obsessive obsessive-compulsive disorder students will have their own, do not have to teach me).
Back to the topic, the expansion U disk has long appeared in our lives. This is not what black technology, the general process is to use a small-capacity U disk, use mass production tools to re-volume, in the production process will U disk capacity to a larger value. In this way, plugging in the computer, the usable capacity of this USB flash drive becomes larger. Then replace it with the original shell, you can take it out as a genuine sale, and the average consumer can not tell that this is a capacity expansion disk. Because the U- disks between different capacities often have very different prices, so many unscrupulous people make, resell and expand U- disks, thus earning huge profits. Interested students can find their own U disk brand production tools to play (I do not bear any responsibility for the consequences caused by).
However, the capacity for capacity expansion is just representation. It shows so much capacity. It does not mean that it can really use so much capacity. Its real capacity is still its original capacity. Suppose there is a capacity expansion disk, the real capacity is 8G , re-production, so that it is displayed as 128G ( proceed early drama, the author of this U disk is the case). When we copy files to a USB flash drive, files within 8G are normal, but after over 8G , the file will have various “spiritual†issues, such as opening the prompt file on another computer. Or simply disappeared and disappeared. If it is used for entertainment, the problems may be able to laugh, but if there is a problem during official use, the consequences can't be imagined . Therefore, the expansion of U disk ultimately harms the interests of consumers .
The principle of this test is to use its capacity characteristics to verify the written data. If all the written data is normal, then it means that this is a normal U disk. If there is a large range of file corruption, it means that this is an expansionist , and the test software has written about 10G . almost, because profiteers are generally not so conscientious, with a capacity of more than 16G or 16G U disk to restart production, 128G U disk there is no need to write all the data (in fact, because I'm too lazy, etc.).
Start file verification.
Sure enough, the tail of its fox emerged. (The green block in the figure indicates that the verification was successful, and the red indicates that the verification failed.)
A total of about 16G files were written , only half passed verification, and all other files were damaged. In other words, its actual capacity is only 8G .
A dignified U-128G, ah!
Many people like to be greedy and cheap and like online shopping. Therefore, the main way to purchase U- disks is naturally choosing online shopping. Online shopping this way is nothing in itself, but it depends on the electricity supplier. Take a treasure as an example, search for " U disk" keywords on the homepage , so the door to the new world is opened.
The author just cut a picture.
I am big and powerful!
Everyone saw it? Normally, the general price of ordinary consumer U disk is about 1G2 yuan, for example, Kingston's DataTraveler series generally follows this rule. U disk with special requirements do not follow this rule. If you are excessively cheap, you must be careful . Everyone must keep their eyes open. They must not be petty and cheap, and mistaken for major events.
Finally, we must remind everyone that online shopping should try to choose a regular self-operated store and do not choose a third-party store without confirmation.
Thanks for the testing tools provided by Digital House. If you have any omissions or inadequacies in this article, you are welcome to contact the author.
( Supplemental an episode : After the author finished the manuscript, he wanted to visit the shop selling this U disk, but found that the site's website link has been opened. )
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