Sunday, December 8, 2024
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How to delete a disk set using Disk Utility in macOS High Sierra

You can use the Disk Utility in macOS High Sierra to delete a disk set that’s no longer needed. When you delete a set, the data recorded on the disks isn’t 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), providing a single volume with all the data. Before deleting anything, back up any important files. Then:

    •    In Disk Utility, select a disk set that you want to delete in the sidebar.

    •    Click the Delete RAID button.

    •    Click Delete.

    •    To erase all the disks in a disk set:

    •    Back up any important files.

    •    In Disk Utility, select a disk set that you want to erase in the sidebar.

    •    Click the Erase button  in the toolbar.

Remove a disk from a disk set permanently

    You can remove individual members of a mirrored RAID set or concatenated disk set. You can’t remove individual members of a striped disk set without first erasing the entire set. You can only remove the last member of a concatenated disk set. 

    •    Back up any important files.

    •    In Disk Utility, select a disk set in the sidebar.

    •    Select the member disk that you want to delete from the set.

    •    Click the Remove button .

    •    Click Remove.

(This how-to is based on my experiences and info on Apple’s support pages where the images sometimes come from.)

Dennis Sellers
the authorDennis Sellers
Dennis Sellers is the editor/publisher of Apple World Today. He’s been an “Apple journalist” since 1995 (starting with the first big Apple news site, MacCentral). He loves to read, run, play sports, and watch movies.