![]() ![]() I have rebooted a few times, and spent days running everything from TechTool Pro on it and it won't go. Method 2: Update the macOS Method 3: Erase Selected Volumes Instead Method 4: Adjust the Security Levels for Formatting an External Device Method 1: Erase your Disk via Terminal If there is a problem with the Disk Utility application on your Mac, then you can try to do the same via Terminal. Tech Tool Pro and Disk Utility don't seem to be able to fix the drive, so I decided to wipe the data by a reformat and writing zeros to the entire drive.Įverytime I try and format, it tells me that the drive cannot be unmounted. When a device cannot erase or partition the drive, users are delivered Couldnt Unmount Disk error or related messages. disk1 Started erase on disk1 Unmounting disk Error: -69888: Couldnt unmount disk. The HDD has been acting up recently, very slow performance, bad behavior etc. unmount disk mac terminal Type diskutil list in the Terminal window. ![]() I have two internal drives in my 27" iMac (10.8.5). The basic syntax for erasing a disk from the command line in macOS is as follows: diskutil eraseDisk FILESYSTEM DISKNAME DISKIDENTIFIER. Have you ever tried to format a disk in Mac OS X and Disk Utility wont Unmount the Hard Drive for formatting It can happen for external (USB and Firewire). ![]()
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