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TechToolPro from Micromat. This has disk repair functionality too, but it is also the only utility that does hardware checks. It can check a drive for bad sectors, and it can also check other hardware too: it can check RAM, onboard video etc etc. You can defrag a drive with Techtool, and it will also allow you to recover files from a damaged volume, although you might want to use a specific file recovery tool like Data Rescue for that. It's been around for sometime, but I question just how useful the hardware tests are, because I've yet had to have it find a bad piece of hardware, even when more in-depth tests using Apple tools do find bad RAM etc. I use TechTool in cases where I want to check for bad blocks on a drive, or if a client insists that I defrag the drive, as unnecessary as that is.
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