This is the nuclear option because it will overwrite every single spot on the device with a zero. Using this command writes zeros to every block of the raw device, meaning you’re bypassing everything and accessing the device itself. Firstly, launch the Disk Utility application on your Mac and make sure the external device is connected to it. $ disktuil partitionDisk diskX 1 MBR FAT32 UNTITLED 100% ← MBR with MS-DOS Start with terminal application>input diskutil list line, and a list of disks on Mac will show up>choose target disk to force unmount>input sudo diskutil unmountDisk force /dev/disk with correct disk number. To adjust its security level and fix the erase process has failed on Mac, follow these steps: Step 1. $ diskutil partitionDisk diskX 1 GPT HFS+ Untitled 100% ← GPT with HFS Format use diskutil listfilesystem to get a full list of supported file systems. ![]() You can unmount a volume from Disk Utility (dont eject it). I like to force a rewrite of the partition map to something that macOS is familiar with like a GPT partition and HFS+ file system. To adjust its security level and fix the erase process has failed on Mac, follow these. Disk Erase failed with the error: Couldnt unmount disk. You must be booting the computer from the Recovery HD partition, a USB stick with the Recovery. Mount & Unmount Drives from the Command Line in Mac OS X, You can mount and unmount drives. Then go to the Erase Tab and select the new expanded partition then click erase. Then expand the first partition to include the whole drive (bottom right hand corner). $ diskutil eraseDisk free Empty /dev/diskX In DU on the partition tab highlight the last partition and click the Minus Sign. (For example to Erase/Partition the disk). This should force unmount the entire physical disk and all its related volumes: 3) Attempt again to perform whichever task caused your ‘Couldn’t Unmount Disk’ error. As the name implies, this does a simple erase of the disk and marks the free space as “empty” with no file system or partition scheme. sudo diskutil unmount force /dev/diskx 2) Press RETURN. 3) Hopefully you can now perform your desired erase, partition, installation or deployment on this drive. There are a few steps you can take, but all are destructive to the data on the device.Įrase Disk. ![]() ➜ ~ diskutil resetUserPermissions /dev/disk2 `id -u`Įrror encountered attempting to reset permissions for user 501 home directory on disk2: Permissions are not enabled on the disk (-69861) My USB drive appears as read only when i do CMD+I, I tried repairing the permissions but that failed too. ➜ ~ diskutil eraseDisk free EMPTY /dev/disk2 ➜ ~ diskutil eraseDisk FAT32 MYSD MBRFormat /dev/disk2 ➜ ~ diskutil eraseVolume exFAT MyName /dev/disk2s2Įrror: -69760: Unable to write to the last block of the device ![]() I’ve tried a bunch of commands that I’ve found here and there in the terminal, but none of them worked, like: ➜ ~ diskutil eraseVolume exFAT MyName /dev/disk2 dev/disk2 (external, physical):Ģ: Microsoft Basic Data Lexar 63.9 GB disk2s2 Disk Utility (macOS Catalina 10.15.2) fails to erase my USB drive (64GB key, currently formatted in exFAT).
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