Two Cognitive Misconceptions about SSD Drives 2

One: Why isn’t SSD Drives always at the highest speed?

Most SSD Drives manufacturers now claim that their own solid-state hard drives continue to read and write faster than 500MBs cloud, which is considerable relative to the 100MBs speed of mechanical hard drives. In fact, few programs start and execute continuously, and only when non-identical copy and paste operations occur in practice, the source disk of the data is continuously read. That is, when you copy and paste a file from the D disk to the E disk, the D disk is constantly reading and writing.

SSD Drives

Two: If my hard disk reads and writes frequently, will the lifetime of the SSD Drives be insufficient, causing it to be scrapped soon?

On some SSD Drives, you will see “Chip labels read and write only 100-1 million times”. So if I apply it to databases, and so on, maybe read and write data more frequently and don’t get damaged very quickly, then it’s not cheap for us to buy a solid state hard disk”? Life span of course is not like that, if it is not safe, it will not be applied to special areas such as aerospace, vehicle and other adverse environments at this time!

Solid state hard disks (SSD Drives) are basically structurally similar to the general mechanical hard disks we use, such as analog sectors, analog tracks, and so on. Inside a solid-state hard disk, the core part is the controller, which is the core of the entire solid-state hard disk. It contains many architectures, such as read and write algorithms, interface definitions, and so on. The main impact on life is the number of reads and writes. In the algorithm definition of solid state hard disks, one modification is considered a real read and write.

Solid state hard disk flash memory has a limit on the number of erases, which is what many people criticize for its short lifetime. A complete erase of a flash memory is called PE once, so the lifetime of the flash memory is in PE units. The lifetime of a 34-nm flash memory chip is about 5000 PE, while that of a 25-nm flash chip is about 3000 PE. Does it look like it has a shorter life span? This is theoretically true, but as the SSD firmware algorithm improves, new SSDs can provide fewer unnecessary writes. Another specific example is a 120G solid state hard disk. Writing 120G files is considered PE once. Ordinary users boast of normal usage, even if they write 50G every day and complete PE once every 2 days on average, then there are 180 PE times a year. You can calculate for yourself that 3000 PE will last for several years. I believe that by then, the SSD Drives will have been replaced by something new by you.

Currently, solid state drives (SSD Drives) based on flash memory technology are provided in BladeCenter HS21 XM blade servers. Compared with traditional mechanical hard disks, solid state hard disks are faster, more reliable, more energy efficient, fewer heat and quieter, and can run operating systems and any other application on blade servers. It also shows that life is no longer a concern for us.

As the number of erases of Flash chips increases continuously, the lifetime of Flash chips is also increasing. According to some current application scenarios, the lifetime of a disk can reach more than 6 years, and the algorithm of the controller is also constantly improving. The lifetime of Flash chips is also increasing from another aspect. It is believed that the future life will be greatly improved.

SSD Drives

2 Comments

  1. nice

  2. Everything is very open with a really clear explanation of the issues. It was really informative. Your website is very useful. Many thanks for sharing!

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