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I was trying to restore a time machine backup but then messed everything up as I had erased the wrong disks and was just being a downright idiot for erasing drives. Now I can’t install a fresh OS or restore time machine. Is there any way I can reformat the drives in disk utility to be about to reinstall a new OS? Here are the images:

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  • What happens when you click "Partition?"
    – Allan
    Apr 14, 2020 at 16:48

1 Answer 1

Reset to default
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From your third picture, that's the drive you need to format.

Click the drive name, as you have in that image, then click Erase [top centre] & supply a name. The rest will automatically be set to the correct parameters - Mac OS Extended (Journaled) & GUID Partition Map.

Apple Partition Map is a very old format type, for 68k & PowerPC Macs, not in general use any more.

On installing Sierra the system will likely change that Mac OS Extended (HFS+) format to APFS, but that will be automatic & need not concern you at this juncture.

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  • It worked! Was able to restore from time machine! Thank you so much!!!!
    – cafe421
    Apr 14, 2020 at 19:43

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