This is a situation that every tech support person has faced or will face at least once: a failed hard drive.

In this particular case, a user was getting errors like "disk 0 error" and "invalid drive specification."

Here were the other facts in the case:

•The data wasn't backed up.

•The problem came out of nowhere.

•The user had accessed Setup and tried to manually enter the settings for the drive type when "Auto" didn't work.

•There was no startup disk made by this machine.

Reviving a drive like that one—even if only long enough to copy its data before you throw the drive in the garbage—is a tough challenge.