I have a 2012 MacBook Pro, and am running the most current OS. How can I format this new hard drive to work for a Time Machine backup? My other MyBook drive works just fine and I don't remember having this issue when I got it and set it up for backing up. I even tried erasing it and choosing the format of the other drive I currently back up to, which is Mac OS Extended (Journaled) and that didn't work. mount drive sudo diskutil mount /dev/disk0s4 Volume on disk0s4 failed to mount If the volume is damaged, try the readOnly option After restarting the. So then I go to Disk Utility, go to the new drive, click "erase" (thinking this should wipe it and reformat it for my Mac), and it fails again because it can't unmount the disk (code -69888). When I go to Time Machine to switch drives, it asks me if I want to erase, I click "erase" (totally fine because it's brand new and has nothing on it yet), and then it pops up with a window that says "there was an error preparing the Time Machine backup disk, couldn't unmount disk". Since I got a new one, I want to start backing up to this drive instead of the other one I'm currently using! Previously, I've used Time Machine to do backups on these drives and had no issues. I tried using the disc utility to check the disc but it says that the disk wont unmount. It is constantly spinning and when I do try to eject it says drive in use by finder. Over the past year, however, I keep getting the message that I have not ejected the disc properly, and the icon disappears from the desktop. The finder wont stop accessing the external drive Since updating to Catalina, I cant eject my external drive without relaunching the finder. Hi all - I have been using Time Machine with a Seagate external drive for the backups. I just purchased my 3rd Western Digital My Book Desktop Drive. Time Machine unmounting itself repeatedly.
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