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Repair a disk in a mirrored disk set using Disk Utility on Mac
When you disconnect a disk thatβs part of a mirrored disk set and then reconnect it, the disk needs to be repaired so it contains the latest data. If you selected the βAutomatically rebuildβ tick box when you created the mirrored RAID set, the disk is repaired automatically whenever you disconnect and reconnect it. If you didnβt select the βAutomatically rebuildβ option, you can reconnect and repair a disk member manually.
Reconnect a disk thatβs a member of a disk set.
In the Disk Utility app
on your Mac, select the disk set in the sidebar, then click Repair. Select the disk you want to repair, then click Choose.
Click Repair.