couldn t unmount disk external hard drive

Couldn t unmount disk external hard drive update#

Now I´m unable to use the external disk, it appers on the desktop but I cannot eject it (because the computer says the disk is being used) I cannot repair it or erase it using disk utility because an error appears: unable to unmount. If the external hard disks connection is damaged, its not going to allow. But Disk Utility says (when I boot from the Lion partition) 'Disk Erase failed with the error: couldn't unmount disk'. Theres something wrong with the cable, for example, the connection cable is damaged.

Since this is no longer necessary now that Lion does the same thing, I'd like to reformat my drive with a single partition.

Couldn t unmount disk external hard drive update#

Download and try Outbyte MacAries right now to see what it can do for your Mac. 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. Solution 3: Use Command Prompt to Force Unmount the Disk. Therefore, your computer cannot suspend any USB devices that are. Solution 1: Use a USB Boot Drive to Repair the Hard Drive.

I tried to use my WD 320gb disk with time machine, while the information was being recorded my lapton run out of power and shut down. A long time ago I partitioned my hard drive to have a separate boot disk. A possible workaround could be unmount the USB programmatically after the copy transfer.