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.(note: be EXTREMELY careful, ask you could wipe your computer if you do this wrong) Methods to Resolve the ‘Disk Utility can’t Erase Mac Hard Drive’ Issue. Thankfully I ended up fixing it quickly (with a little googling). 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 You get this error, and the details vary depending on the format type you try The system can’t unmount the disk you are currently booted from. Stellar Partition Manager is an alternative to Disk Utility that. What happens if you just try to erase it, without trying first aid If you need first aid to attempt a file recovery - do you have access to another Mac Another tip that might work - plug in the LaCie, and don't try anything (don't open your Disk Utility, or anything else that might access that drive). Fixing with Stellar Partition Manager Software.
#Mac cannot unmount disk to erase how to
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. How to Fix Couldn’t Unmount Disk Error on Mac A. If the error persists, reboot the computer and try again. As a first line step be sure to close all open files and programs and try again. Are you trying to erase a USB drive on your mac but getting this error as soon as you insert it? Couldn’t unmount disk errors usually appear in Disk Utility when the boot drive is busy.
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