Greyed out partition option on disk utility

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Level 1

8 points

Greyed out partition option on disk utility

Hi,

I'm running Mac OS Mojave 10.4.3. I have a new external transend HD and I would like to partition it. I was able to Erase and format it to Mac File system but it will not let me partition it. I have not had problems with this on earlier versions of Mac OS. I don't understand why the function is not available.

MacBook Air 13", macOS 10.14

Posted on Mar 21, 2019 4:39 AM

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Answer 1

Best reply

dialabrain

Level 10

122,723 points

Mar 21, 2019 5:00 AM in response to vossabart

Make sure Disk Utility's "View" is set to "Show All Devices" and when you formatted the drive the scheme was set to GUID.

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Answer 2

Mar 21, 2019 5:03 AM in response to vossabart

Some time ago Disk Utility was (de-)enhanced. :( You need to do the following.

In the top left corner make sure in the View menu that 'Show all devices' is selected
Now you will see the 'parent' device for the external drive, select this
Now you will be able to select the Partition button

The issue is you can partition an entire drive but you cannot partition a partition, hence the need to first select the parent i.e. entire drive.

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Answer 3

vossabart Author

Level 1

8 points

Mar 21, 2019 5:17 AM in response to John Lockwood

Thank you, I can't believe I missed that. :-)

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Greyed out partition option on disk utility

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