Unable to convert volume to APFS

oscarodas

macrumors regular
Original poster
May 7, 2013
121
57
Sydney Australia
Hi, I have two internal and two external drives, I'm trying to format all my drives to APFS My High Sierra drive system is APFS and one of the external drives is APFS the other two are Mac OS Extended system, when I try to convert them I get the following error, The operation couldn't be completed error-69888.
Even trying to force unmount the volume fails.
 

Fishrrman

macrumors P6
Feb 20, 2009
17,226
5,559
My opinion only, but you're probably better off to "leave APFS alone" for the time being.

It seems to be causing much more grief than it's (currently) worth!
 

Kekinash

macrumors member
Nov 24, 2016
57
31
-
You need to switch the MBR to GPT disk type to be able to succeed. I used under windows, Minitool Partition wizard 10 (Free) to convert an usb 32GB key from MBR to GPT type, and then inserted it under Mac OS and used the Disk Utility to erase it and format it as an APFS encrypted.