![]() I installed that onto an SSD I had handy, and after running through basic diagnostics that confirmed the Mac was fine, I used its Surface Scan tool to see if it could identify whether bad blocks (unusable small segments) on the disk. I purchased and installed TechTools Pro 9.5, which can create a bootable Mac system that includes itself. Sometimes, even a failing drive can be duplicated, but it was in too bad a shape for that, whether through Recovery mode and Disk Utility or Target Disk Mode.I used Target Disk Mode to mount the Mac onto another Mac to see if Disk Utility might be able to perform magic that way, and it also failed.I could launch Terminal in recovery to use the diskutil program to force the drive to unmount, but Disk Utility would always wind up reporting that it was unrepairable.The Mac could boot into Recovery, but Disk Utility couldn’t perform a repair on the drive, as it wouldn’t unmount.However, the same symptoms resulted when exiting into a full startup environment. Starting into single-user mode worked, as did performing the fsck command-line function to make sure a drive was left in the correct state for booting.Very quickly, it appeared the drive was damaged, not just corrupted. This worked just fine for six weeks, until she started to receive errors while using her mail client, restarted, and had screens of Matrix-like text scrolling down.
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