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Two Macintosh HD-Datas: URGENT

Hi, I have recently factory reset my Mac and I have two Macintosh HD-Datas: one is called Macintosh HD - Data and another is called Macintosh HD-Data-Data. What should I do, as I know this is incorrect?

MacBook Pro 13″, macOS 11.0

Posted on Nov 27, 2020 2:07 AM

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Posted on Nov 27, 2020 2:47 AM

The Big Sur installer creates a second volume in the APFS container at the start of a new installation, so when you erase and reformat a disk, you need to delete extra volumes using the +/- icons. If you don't, you get the situation you describe.


First, I would make sure to have made a Time Machine backup and a Bootable USB installer, before either starting again by a complete erase/reformat/install, or maybe first try just deleting the redundant volume, which I am guessing is the Data - Data one.


An additional complication I found, is that Disk Utility sometimes does not refresh its display as one might have wanted. Quitting and re-opening it finally showed the actual disk state.

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Question marked as Top-ranking reply

Nov 27, 2020 2:47 AM in response to yc_121

The Big Sur installer creates a second volume in the APFS container at the start of a new installation, so when you erase and reformat a disk, you need to delete extra volumes using the +/- icons. If you don't, you get the situation you describe.


First, I would make sure to have made a Time Machine backup and a Bootable USB installer, before either starting again by a complete erase/reformat/install, or maybe first try just deleting the redundant volume, which I am guessing is the Data - Data one.


An additional complication I found, is that Disk Utility sometimes does not refresh its display as one might have wanted. Quitting and re-opening it finally showed the actual disk state.

Two Macintosh HD-Datas: URGENT

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