What happened to the traditional hard disk?

The traditional hard disk has a fatal problem, that is, it needs to drive the motor to rotate the disk ~ this will cause serious delay in reading the disk! Think about it, you have to know which sector the data is in, then command the motor to start rotating, and then let the magnetic head read the correct data. In addition, if the data is placed discretely (the sector is wide and discontinuous), then the reading and writing speed will be delayed more obviously! The speed is not fast So later, some manufacturers used flash memory as large-capacity devices, and the connection interfaces of these devices were also through SATA or SAS, which looked the same as traditional disks! So, although this device can no longer be called a disk (because there are no heads and disks! All are memories). But for the convenience of everyone, let's call it a plate! Just different from the traditional hard disk drive (HDD), it is called solid state hard disk or solid state drive (SSD). The biggest advantage of SSD is that it doesn't have the feature that the motor doesn't need to rotate, but it can read and write directly through the memory, so it saves electricity besides data delay and speed! But the early SSD has a very important fatal wound, that is, these flash memories have "write times limit", so the life of SSD is usually about two years! Therefore, when storing data, we should consider the backup or RAID mechanism to prevent SSD from being damaged!