![]() At the prompt paste these lines individually pressing RETURN at the end of each line. If that doesn't work then quit Disk Utility and open Terminal from the Utilities' menu. fdisk doesn't do anything.Īny ideas how to fix a disk that is this severely screwed? -bash-3.2# diskutil listġ: Apple_Boot Recovery HD 650.0 MB disk1s1Ģ: Apple_HFS Mac OS X Base System 1. After doing that click on the Unmount button in the toolbar to see if the disk disappears from the Desktop. When you connect an external hard drive or flash drive to an Apple computer, the Mac OS X operating. When I attempt to run fdisk to correct the MBR. Use the Terminal tool to manually mount drives on a Mac. I get an "error 6988 couldn't unmount disk". The basic syntax for erasing a disk from the command line in macOS is as follows: diskutil. When a device cannot erase or partition the drive, users are delivered Couldnt Unmount Disk error or related messages. Now in Disk Utility, sometimes I see the SSD drive and sometimes I boot and it's not there but I can never erase or partition it. To erase a disk from the command line on the Mac, we’ll use the familiar diskutil command with the eraseDisk verb and other appropriate flags to specify options for how we want to erase the disk, and to identify which disk is to be erased. The command displays a list of your Macs optical drives. I erased the SSD drive in my MacBook and was reinstalling Lion when it failed about 75% through the install. Enter drutil list into the Terminal and press Return if the disc does not eject.
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