The emergence and development of SSD solid state drives, compared with the traditional HDD mechanical hard disk, has brought a revolutionary speed reading and writing revolution to users. However, SSDs have always faced greater risks, and abnormal power failure is a fatal one. ring.
Due to unexpected power failure, blue screen of death, etc., the computer does not shut down properly, it can be called abnormal power off, and SSD is integrated circuit storage, it needs to be continuously powered during reading and writing, so if abnormal power failure occurs, it will not only cause Unsaved data in the SSD is lost, and in extreme cases, the previously written data is in error, making the SSD unrecognizable by the system.
In layman's terms, the SSD will be completely turned into a 'brick', and it is impossible to save the data. It is not like a mechanical disk.
So, why does an abnormal power outage cause such a big damage to the SSD?
This is mainly because The SSD sets an FTL table (Link Table) in the internal DRAM cache. It is responsible for recording the metadata necessary for the SSD to work normally. Although it is independent of user data, it plays an indispensable role in the normal operation of the SSD.
After abnormal power failure, the metadata in the FTL table is easily lost or damaged, and the SSD naturally cannot be read or written normally.
If the SSD is damaged or bricks due to abnormal power failure, the most effective emergency method is to repair the damaged FTL meter after power-on. However, this process takes a certain amount of time, so there is a 'powered for 30 minutes idle'. The practice, that is, after power-on, don't rush to do anything with the SSD, let it stand still for about half an hour.
However, this emergency method is not necessarily successful. Therefore, on the one hand, it is necessary to pay attention to prevent accidental power failure during the use of SSD. On the other hand, you can also consider purchasing SSD with tantalum capacitor power-down protection, but only for part. High-end SSD and enterprise SSD.
