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10.4: Recover a dead hard drive using GNU ddrescue
The amount of time diskwarrior takes can definitely vary widely: although it often takes only a few seconds to run, I've heard of it taking as long as three days on a damaged hard drive... and successfully restoring a system that had been unable to start up before.
10.4: Recover a dead hard drive using GNU ddrescue
DiskWarrior has an often overlooked preview option. If you have rebuilt a drive you suspect of having problems, click on the "Preview" button in the lower left hand corner, and DiskWarrior will mount a read-only version of the drive. This drive shows up to other disk utilities as a real drive, and I've had very good luck imaging from this preview drive using utilities like carbon copy cloner. I do agree that it is rather impolite of DiskWarrior to dump the rebuilt directory with no warning if it encounters a problem during the replacement.
10.4: Recover a dead hard drive using GNU ddrescue
The publisher of Diskwarrior, Alsoft, claims that Diskwarrior's directory replacement process won't wipe the old directory until it's successfully written the replacement directory (unless there isn't enough free space for the replacement directory, in which case Diskwarrior will write over the old directory, which can be unsafe if there's a power outage, a crash, etc.), but sometimes, especially on drives that have bad blocks, this guarantee doesn't hold up. Whenever you see Diskwarrior report "Speed inhibited by disk malfunction", it means the drive has bad blocks, and you shouldn't let Diskwarrior try to replace the directory--as mathias01 says, use Diskwarrior's Preview option to Finder-mount the results of Diskwarrior's scan, and copy your files from that preview volume to a backup drive. |
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