The startup disk cannot be partitioned or restored to a single partition.

Trying to run BC but it says "The startup disk must be formatted as a single Mac OS Extended (Journaled) volume or already partitioned by Boot Camp Assistant for installing Windows." I read from similar questions to run diskutil list in terminal, but I can't really make any sense out of this. Help would be much appreciated.


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Posted on Feb 21, 2018 1:14 PM

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Feb 21, 2018 2:06 PM in response to jariola

After we cleanup, I recommend disconnecting all external storage/hubs and a SMC/NVRAM Reset before your next attempt at installing Windows.


Run


diskutil eraseVolume jhfs+ BC1 disk0s3

diskutil eraseVolume jhfs+ BC2 disk0s4

diskutil mergePartitions jhfs+ BCMP disk0s3 disk0s4

diskutil list


If you only see disk0s3, then run


diskutil eraseVolume fat32 BOOTCAMP disk0s3


and now run BC Assistant and click on Remove/Restore.

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The startup disk cannot be partitioned or restored to a single partition.

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