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The computer is connected to two hard drives. Why does the name change with one change? One is online, and the other one is offline.

These two hard disks should have undergone operations such as Raid1. Raid1 means that the contents of the two hard disks are exactly the same. The same goes for disk signatures. When the system recognizes two identical disk signatures at the same time, one disk will be displayed as online and the other as offline. If you mount a specific hard drive separately, they must all be online