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artician

macrumors newbie
Original poster
Jan 4, 2010
5
0
Mid2015 MBP with Sierra - I partitioned my SSD via command line to dualboot an unsupported OS. It didn't work out, so I am falling back to using Boot Camp with Win8.

I originally formatted and partitioned the drive as a GUID partition table. I did this in Sierra, and later upgraded to High Sierra without realizing it would convert the drive to APFS.

Now OSX is installed under a "Container" object within the main drive volume. The view from Disk Utility looks something like this:

APPLE SSD (512GB, GUID Partition Map)
|_Container disk 1 (APFS Container)
|__OSX (128GB, APFS Volume) <-- Where OSX appears to be installed

I can't seem to re-extend the OSX volume into the remaining ~300GB of unused space, even though Disk Utility sees it. Can anyone help me understand what I've done? Do I need to reformat the entire drive in recovery mode, is there a way to convert that parent GUID volume to APFS and reabsorb the OSX volume to access the full drive capacity?

Many thanks for any help.
 
GUID is a partition table. It is not a volume format. APFS is both a container, and a file system. APFS sits on a GUID partition. Your disk has always been and still is GPT/GUID, and High Sierra hasn't changed that. High Sierra converted HFS+ to APFS.

The command you want is

"diskutil apfs resizeContainer "Insert disk identifier here" 0"

0 specifies a "fit to disk size"
 
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