Delete a disk set using Disk Utility on Mac
When you no longer need a disk set or want to remove individual disk members permanently from the set, you can delete the set.
Important: You can remove disks from a mirrored RAID set or concatenated disk set without deleting the set. To remove a disk from a striped RAID set, you must first delete the set—which deletes all your data. Always back up before you delete the set.
Delete a disk set
When you delete a set, the data recorded on the disks is not deleted. For example, deleting a mirrored RAID set leaves each disk in the set with a copy of all the RAID data. When you delete a concatenated set, all the data is copied to the first disk of the set (as long as the first disk has enough disk space to store the data), resulting in a single volume with all the data.
Important: Be sure to back up any important files before deleting a set.
Go to the Disk Utility app
on your Mac.If Disk Utility isn’t open, click
in the Dock, type Disk Utility in the Search field, then click .Select the disk set you want to delete in the sidebar.
Click the Delete RAID button.
Click Delete.
Erase all the disks in a disk set
Important: Be sure to back up any important files before erasing all the disks in a disk set.
Go to the Disk Utility app
on your Mac.If Disk Utility isn’t open, click
in the Dock, type Disk Utility in the Search field, then click .Select the disk set you want to erase in the sidebar.
Click
.
Remove a disk from a disk set permanently
You can remove individual members of a mirrored RAID set or the last member of a concatenated disk set. You can’t remove individual members of a striped disk set without first erasing the entire set.
Important: Back up any important files before removing individual members of a disk set.
Go to the Disk Utility app
on your Mac.If Disk Utility isn’t open, click
in the Dock, type Disk Utility in the Search field, then click .Select a disk set in the sidebar.
Select the disk member that you want to delete from the set.
Click
.Click Remove.