I tried googling it but nothing seems to answer my question. Then this: diskutil erasedisk is the ID of your disk. 1 Hi I wanted to reformat my HP 500GB hard disk to MS DOS (FAT) by using Disk Utility but Disk Utility kept saying that the hard disk cannot be unmounted.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 You get this error, and the details vary depending on the format type you try You can also burn GParted to a CD, boot it and try to format your external HD from it. Alternativly you can prevent a device from being automatically mounted following this tutorial. Replacing ExternalHDName with the your disks name. Create a disk image Convert a disk image to another format Resize a disk image Restore a disk image to a disk Set up and manage RAID disk sets. To fix this issue, you can try to manually mount the Toshiba drive, update disk driver, repair drive errors, recover data and reformat the drive on Mac. What causes the 'Couldn't Unmount Volume' error The causes of this error are several, starting with the abrupt shutdown and inconsistent file system. A greyed out external hard drive in Disk Utility indicates that the system can't mount the drive, so an unmounted disk won't show up either in Finder or on Mac desktop. Here’s a summary of the process: In Disk Utility (or Terminal) obtain the device name of the APFS container or volume you want to check. 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. Alternatively, try forcing an unmount with disk utility: sudo diskutil umount force /Volumes/ExternalHDName. Usually, the error 'Couldn't Unmount Disk' shows up when you try to format, partition, verify or repair internal disk by Disk Utility on Mac system. The bizarre twist is that you can use Disk Utility’s Unmount tool to unmount volumes and containers which the app itself appears unable to unmount successfully. 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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