![]() Then this: diskutil erasedisk is the ID of your disk.Type this very carefully (sudo might not be necessary): sudo diskutil unmountDisk force /dev/disk2.You must have superuser privileges to do this. Unmount the drive by typing the command 'sudo umount' followed directory that it is mounted on. ![]() Locate your drive, remember the path that it is Mounted on. Even the hard disk of the perfect piece of technology needs a little TLC (or. External Hard Drive, Usb drive, Flash drive, Yosemite OS X, El Capitan OS X, Macbook pro, iMac, macbook air, macbook, macbook retina display, macbook retina. Open a terminal and type 'df -h' to list all drives. (note: be EXTREMELY careful, ask you could wipe your computer if you do this wrong) You can also use the fsck utility to check the health of external drives. Thankfully I ended up fixing it quickly (with a little googling). I assume you have the drive formatted to HFS+. I boot into the Recovery HD/Repair Disk and then TM will work perfectly until I unmount the second drive the next time. Whenever I unmount the second drive, my next TM backup will not complete. I was getting things like: ”could not modify partition map” and “couldn’t unmount disk.” Other things could be things like “couldn’t open device.” Erasing an External USB or Hard Drive that keeps failing in Disk Utility Fix 1: Erase Disk via Terminal Fix 2: Update the macOS Fix 3: Erase Selected Volumes Instead Fix 4: Adjust the Security Levels for Formatting an External. I have another external drive plugged into my TM disk. You get this error, and the details vary depending on the format type you try That might be because the disk is a Windows/Linux bootable formatted as FAT-32, which OSX cannot read.Īnd then when you try to erase in disk utility, the USB is greyed out and First Aid doesn’t work, you can’t repair it, and you can’t mount or unmount it. Are you trying to erase a USB drive on your mac but getting this error as soon as you insert it?
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