This disk is also locked, so I cannot re-install High Sierra.
In the Disk Utility, the options for erase, restore and unmount are all unavailable, I imagine that's because you normally cannot do any of these on the OS X Base System disk. 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. This new disk image cannot be partitioned: when I hit the + sign in the partition screen, nothing happens. When I attempt to run fdisk to correct the MBR. I get an "error 6988 couldn't unmount disk". appears when attempting to modify the boot disk, which you cant because its where your operating. Disk Utility may inform you that the drive is repaired. 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. If Disk Utility doesn’t make that message, take the next step. I erased the SSD drive in my MacBook and was reinstalling Lion when it failed about 75% through the install. For some reason, it was showing as Mac OS Extended, not journaled (which it wasnt the way I originally formatted it). Disk Erase Failed with the error: Couldnt unmount disk - FIX Mac - YouTube Disk Erase Failed with the error: Couldnt unmount disk - FIX Mac Tech & Design 343K subscribers.
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