Unable to convert volume to APFS

[oscarodas]

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]

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!

 

[dianeoforegon]

You might find this article interesting:

Pondering the conversion from HFS+ to APFS | Carbon Copy Cloner | Bombich Software

 

[Kekinash]

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.

 

[oscarodas]

Thanks for the reply, I will leave until a good solution comes by.