Partitioning disk taking too long

I’m trying to install Windows bootcamp again, because I tried to delete it to add more storage, and I’m stuck at the “Partitioning disk...” part. The first time and second time I have downloaded bootcamp it worked like a charm, but my recent tries have been really irritating. Any solutions?

iMac Pro

Posted on Apr 24, 2019 6:08 PM

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Posted on Apr 28, 2019 5:49 PM

Uniblizz wrote:

(After 2nd try for Windows Install)
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk0
   1:                        EFI                         209.7 MB   disk0s1
   2:                 Apple_APFS Container disk1         750.0 GB   disk0s2
   3:         Microsoft Reserved                         16.8 MB    disk0s3
   4:       Microsoft Basic Data                         250.0 GB   disk0s4

If this is your current partition layout, run


diskutil eraseVolume jhfs+ BC1 disk0s3

diskutil eraseVolume jhfs+ BC2 disk0s4

diskutil mergePartitions jhfs+ BCMP disk0s3 disk0s4


If you these commands complete without any errors, then


diskutil eraseVolume fat32 BOOTCAMP disk0s3


and now run BCA and click on Remove/Restore.


Once you have your full disk space in macOS, re-run BCA and try to install Windows. You can skip the Create+Download steps.

167 replies
Question marked as Top-ranking reply

Apr 28, 2019 5:49 PM in response to Uniblizz

Uniblizz wrote:

(After 2nd try for Windows Install)
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk0
   1:                        EFI                         209.7 MB   disk0s1
   2:                 Apple_APFS Container disk1         750.0 GB   disk0s2
   3:         Microsoft Reserved                         16.8 MB    disk0s3
   4:       Microsoft Basic Data                         250.0 GB   disk0s4

If this is your current partition layout, run


diskutil eraseVolume jhfs+ BC1 disk0s3

diskutil eraseVolume jhfs+ BC2 disk0s4

diskutil mergePartitions jhfs+ BCMP disk0s3 disk0s4


If you these commands complete without any errors, then


diskutil eraseVolume fat32 BOOTCAMP disk0s3


and now run BCA and click on Remove/Restore.


Once you have your full disk space in macOS, re-run BCA and try to install Windows. You can skip the Create+Download steps.

Apr 27, 2019 4:12 PM in response to Uniblizz

Ah, you did correct on page 2. For a late 2013 Mac, we should be fine.


Disconnect all external storage, leaving only keyboard and mouse/trackpad connected.


Run the following two procedures.


How to reset the System Management Controller (SMC) on your Mac - Apple Support

Reset NVRAM or PRAM on your Mac - Apple Support


Once completed, connect the USB and boot using Alt/Option and try to run the installer.

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Partitioning disk taking too long

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