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 ![]() Select the main hard drive, not the volume then click on the Erase tab. When a device cannot erase or partition the drive, users are delivered Couldnt Unmount Disk error or related messages. Fist I had to delete the (HFS) volume and the create a new NTFS volume. Click on the small down arrow at the top-left corner of the Disk Utility window and select Show All Devices. Nor will it let me reinstall macOS ('The target volume is part of incomplete system and can not be installed to. In this situation, one should follow the. Since I cant unmount it, I cant erase it an attempted erase says it 'couldnt be unmounted because it is in use by process 717 (kextcache)' 'Couldnt unmount disk. It usually occurs if an SD card got corrupted or infected by virus. If you need to go between Mac and Windows then you would want to select ExFAT. For example Mac OS Extended (Journaled) or APFS. If you are using it for Mac only then select a format specifically for macOS. You get this error, and the details vary depending on the format type you try On windows Machine, formatting drive to NTFS in Disk Management application. This problem is very common with SD cards. To resolve this, you must first erase the disk and set the Scheme to GUID Partition Map. because Spotlight prevents the unmount request). The Disk Utility in Recovery Mode is unable to erase the top level disk containing the Macintosh HD (and with all disks/volumes showing, ie.: Apple Disk Image Media which contains OS X Base System volume). ![]() 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. Click the Eject button next to any volumes on the disk to preemptively unmount them before erasing the disk. 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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