It will do this unless either the bad block is in a critical area that cannot be mapped out at the moment or the bad block table is full. The drive controller in them automatically tries to map out bad blocks as they are encountered. TechTool Pro should not normally report bad blocks for these types of drives. Unfortunately, a modern SATA drive shouldn't have any bad blocks. After all, 56 out of 1.8 billion is minuscule.
TTP also found bad blocks - 56 (so two less than Disk Genius, but I don't make much of that either way). It one-upped Disk Genius as it found bad blocks it told me which of them had files (none in this case). Andy M clued me to a MacUpdate bundle, so I got TechTool Pro 6 for $50 (plust a bunch of other apps I don't care about). Yes, the Mac needs an OS level uninstaller.) (Incidentally, Disk Genius has a built in uninstall feature - very nice. That seems a modest number, but DG said I needed to replace the drive. It found about 58 bad blocks - out of 1.8 billion. Disk Warrior has a good reputation, but Disk Genius has a trial version. So I checked out Disk Warrior, Disk Genius and TechTool Pro - 3 reputable diagnostic apps. Then I ran my Apple Hardware Test - extended, and loop mode.
CHECKING AN EXTERNAL HD USING TECHTOOL PRO 10 DRIVERS
(Most non-trivial diagnostic work requires a wired keyboard and mouse Apple's bluetooth keyboard/mouse drivers may be unavailable when needed.)Īfter I deleted the bad (non-critical happily) files I ran Disk Utility - but the drive passed.
It was time for some diagnostics, so I plugged in my old Apple Keyboard and mouse. That suggests my 24+ month old 1TB iMac drive is dying youngish. I knew from some backup issues that I had 3 unreadable files. (Once upon a time software was the cause, but these days it's hardware.) In the Mac world, that suggests a hardware problem. I've been having suspicious application crashes lately.
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