Shulou(Shulou.com)06/02 Report--

The emergence and development of SSD has brought users a revolution in speed reading and writing that has never been seen before compared to mechanical hard disks. However, despite this, the risk faced by SSD is still not small, and abnormal power failure is a fatal link.

Due to unexpected power failure, blue screen crash and other reasons leading to the computer did not shut down normally, can be called abnormal power failure. SSD is integrated circuit storage, which requires continuous power supply during reading and writing. Therefore, for SSD, once an abnormal power failure occurs, it will not only cause the data that has not been saved to be lost, but also cause the previously written data to be wrong, so that SSD cannot be recognized by the system. In other words, it has completely become a "brick."

SSD abnormal power change brick is because SSD stores FTL table in internal DRAM cache, this FTL table records the metadata necessary for SSD to work normally, it has nothing to do with the data that users want to store, but plays an indispensable role in the normal operation of SSD. The harm of abnormal power failure is to lose and damage these metadata, resulting in SSD unable to read and write normally.

If abnormal power failure causes SSD damage or brick change, the most urgent way is to try to repair the damaged FTL table after restoring power, because this process takes a certain amount of time, so there is a practice of "30 minutes idle after power supply".

However, this remedy is not always successful, and whether SSD has adequate protection mechanisms to cope with abnormal power outages is its safest way to reduce data loss and prevent brick-changing.

As a storage tool, SSD's biggest role is to store data. If even data cannot be safely preserved, then this SSD not only has no meaning to exist, but the damage caused by data loss to users is even more incalculable.

Therefore, for users, the purchase of SSD must be carefully selected. A good SSD not only needs to have super performance, but also needs to be superior in terms of data security.

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