Analysis of the gap between U disk and SSD

similar structure, u disk can be used as a solid-state hard disk?

Now u disk prices continue to slide, the 8GB u disk most also sell to fifty or sixty Yuan, 16GB USB drive is more than 100 blocks full of streets, this and thousands of dollars of solid state drives, compared to the formation of a very large contrast. From a structural point of view, U disk and SSD have many similar places. First of all, as stored data tools, they use flash as a storage medium, using voltage changes to write "0" or "1" data to store information. Second, they do not have mechanical hard drives in the mechanical components, no matter how users shake it, as long as it is not a violent throw on the ground, the basic will not be caused by external damage. There are so many similarities, so there are users to be pondering, can u disk as a solid-state hard disk to use it?

　　One of the gaps between U disk and SSD: storage speed

In fact, in theory, the U disk as a solid-state hard disk to use is not not, for example, now some versions of the Linux system to support the system installed to the U disk, which runs on a U disk, such as the U disk disguised as a solid-state drive. But once the U disk as a solid-state drive as a system disk to use, there is the biggest problem, that is read marry write speed too slow! This is mainly because of the USB disk and solid state drive between the master chip, the number of flash particles and cache capacity caused by different. In particular, the solid-state hard disk uses a number of flash particles, and its internal is similar to the use of RAID writing, can simultaneously on different particles to write or read data, so performance is extremely 慓. and the U disk is usually a single channel to write, so there is no way in the performance and solid-state hard disk compared. In addition, in the cache, solid-state drives generally have 32M or more capacity to store data, and the vast majority of U disk does not have a buffer, so the performance also caused a considerable difference.

　　The gap between U disk and SSD: service life

In addition to the huge difference in speed, the main control of U disk is also mostly do not have the average write data function. What is the average write data? Simply put, the flash disk and the solid-state drive have a certain number of write life. Once the number of writes has reached this amount, it is no longer possible to write data, which means the damage to a U disk or SSD.

As we all know, if as a system disk, the number of data written every day will be many, so the main control chip of solid state hard disk has an average write data algorithm to prolong the service life. Simply put, if there are 10 blocks of data in a solid-state drive (small note: Just for the convenience of example, in fact, far more than 10 blocks of data, when we write data repeatedly, in order to ensure that 10 pieces of data have the same number of writes, so even if each block of writing only 10 times, In theory, the number of blocks that cannot be written will appear only after 10 of the 10 times.

And what if there's no such thing? If Luck is bad, then 10 times, there will be the first bad block appear. and the U disk is not have the average write data function, so once the U disk used to read and write data repeatedly, it is very easy to cause damage.

In fact, from the current U disk technology, the main problem is still out on the main control chip. Believe that the vast majority of users have a U disk plugged into the computer and the need to format the experience. This is often the main chip can not protect the performance of a good data, once used to store the system and this problem, it must be a crash.