I am trying to change the format of my Lacie external hard drive from MacOS Extended Journaled to APFS so that I can store my OneDrive files. I keep getting unmounting errors. Here is a screen capture of the error. The drive is connected to an iMac running the latest Big Sur. Suggestions?
iMac Line (2012 and Later)
Boot into Safe Mode by booting with the Shift key held down and erase the hard drive from there. Then reboot normally.
NOTE: Safe Mode boot can take up to 10 minutes as it's doing the following;
• Verifies your startup disk and attempts to repair directory issues, if needed
• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)
• Prevents Startup Items and Login Items from opening automatically
• Disables user-installed fonts
• Deletes font caches, kernel cache, and other system cache files
Boot into Safe Mode by booting with the Shift key held down and erase the hard drive from there. Then reboot normally.
NOTE: Safe Mode boot can take up to 10 minutes as it's doing the following;
• Verifies your startup disk and attempts to repair directory issues, if needed
• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)
• Prevents Startup Items and Login Items from opening automatically
• Disables user-installed fonts
• Deletes font caches, kernel cache, and other system cache files
Above procedure for non-M1 Macs?
Yes.
If you click on that link that Old Toad provided above, Apple has included Intel and Apple Silicon procedures that trigger Safe Boot.
External disk could not be unmounted because of process 58
