I am at a loss for what to do here, and any suggestions are greatly appreciated. Then to unmount it: sudo diskutil unmountDisk /dev/disk1 forced unmount of disk failed at least one volume could not be unmounted The Fix. Back up as many of your files as possible, reformat the disk, and restore your backed-up files. On my machine the 4TB WD Elements was /dev/disk1. Error: Disk Utility can’t repair this disk. Volume repair complete.Updating boot support partitions for the volume as required. I have made sure no files are in use, yet I still receive this message when I never have before.Īlso, if I attempt to run another repair through Disk Utility once the partitions are unmounted, I see this: To eject the disk immediately, click the Force Eject button. The disk “Storage” wasn’t ejected because one or more programs may be using it. If I try to unmount from Finder, I receive this message: Almost forgot about this from Disk Utility: Disk Utility can’t repair this. If you have any idea to get the HDD working or even safe the files, I would be really grateful. Reinstall Lion/Mountain Lion, Mavericks: Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button. the Erase button and wait until the process has completed. When I attempt to run a Disk Utility repair, this occurs: This was the try: sudo diskutil eraseDisk JHFS+ DISKVOLUME disk1 Started erase on disk1 Unmounting disk Error: -69888: Couldn't unmount disk. the Security button and set the ZeroData option to one-pass. Caution must be used with this approach however because forcibly unmounting a disk can cause data loss of the drive being forcibly unmounted. Today, my time machine backups started failing on the device, and eventually I lost access to backups (as well as my music and photos on another partition). Disk by Command Line in Mac OS Another method uses the command line to force unmount a disk, but this is not the top recommended option because of potential for data loss. I have a Western Digital MyPassport 1TB external hard drive, that’s less than 1 year old.
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