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) 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 Erase it using the standard Mac Disk Utility (exFAT works fine). You get this error, and the details vary depending on the format type you try Clonezilla Live on USB flash drive or USB hard drive. 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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