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Time Machine under the latest Mojave

I used Disk Utility to 'erase' an external drive to APFS and tried to use it as a backup drive for Time Machine.


Time Machine says "Oh no! You can't use that! You must have it formatted as Mac OS Extended (Journaled)".


So I went back to Disk Utility and when trying to 'erase' it back to 'Mac OS Extended (Journaled)' that option no longer appears in the 'Format' dropdown.


What can I do? Is there some sort of Terminal command I can use to get that external drive back which I especially bought for Time Machine?


Thanks in advance.

MacBook Pro 15", macOS 10.14

Posted on Jan 21, 2020 2:59 AM

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Question marked as Top-ranking reply

Posted on Jan 21, 2020 3:07 AM

Open Disk Utility, click on View, select Show All Devices.

Highlight the Disk in the left hand column, not any of the indented Volumes.

Click Erase, give the Disk a name,

Format: Mac OS X Extended (Journaled)

Scheme: GUID Partition Map.

Click Erase.

2 replies

Time Machine under the latest Mojave

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