![]() ![]() If you have something open on the drive like a Disk Image or if something else is keeping the drive busy, you may. If the Security Options button is not available, Disk Utility cannot perform a secure erase on the storage device. This error can be caused for a few reasons. ![]() The command sudo diskutil unmountDisk force /devdisk0 failed because at least one volume could not be unmounted. The diskutil list command brought up just /dev/disk0 (plus disk0s1, disk0s2 and disk0s3). Secure erase options are available only for some types of storage devices. Trying to erase my hard drive and it won’t unmount: Disk erase failed. Connected it to the Mac, partitioned and formatted without issue. If Disk Utility cant see your disk, it also cant see any containers or volumes on that disk. (Optional) If available, click Security Options, use the slider to choose how many times to write over the erased data, then click OK. 1 Just for the sake of having an answer here, this is what ended up fixing the problem: Connected the disk to a windows XP machine Deleted the existing FAT32 partition that the device shipped with using Disk Management under XP. ![]() If the Scheme pop-up menu isn’t available, make sure you selected the storage device you want to erase-it’s at the top of the hierarchy.Ĭlick the Format pop-up menu, then choose a file system format. Are you trying to boot to your recovery partition first and run Disk Utility (Restart and press command plus r to get into recovery. Ĭlick the Scheme pop-up menu, then choose GUID Partition Map. In the sidebar, select the storage device you want to erase, then click the Erase button. If you want to erase any other type of storage device: Double-click Disk Utility in the /Applications/Utilities folder. Note: If you want to get your Mac ready to trade in, sell, or give away, and your computer is a Mac with Apple silicon or an Intel-based Mac with an Apple T2 Security Chip, use Erase Assistant. ![]()
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