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When a warning about NAS hard drive failure pops up on your phone, the first reaction is to panic, but the second reaction is the key: There are four plates inserted in four positions. Which one is broken? This article clearly explains the three-step method of checking the disk number - look at the disk indicator light, check the disk number according to the serial number in the background, and use the command to identify the disk in SSH. It will also talk about what will happen if the wrong disk is pulled out, and why it is necessary to copy the serial number first before replacing the disk. ...