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Message: <blockquote data-quote="chas_m" data-source="post: 1636038">From what you've written, I'd say the hard drive has a bad sector it keeps hitting or is starting to fail (despite passing the tests).One option if you feel like spending the time: clone your existing hard drive to a bootable backup (using Carbon Copy Clone, Chronosync, or Super Duper et al), then boot from the clone (USB3 recommended) and zero out (single pass) the boot hard drive. Then use your clone program to "clone back" and see how that does. If the problem goes away, it was a bad sector (the zeroing process will lock out any bad sectors, but bad sectors are often a sign of a failing HD).If the problem doesn't go away, I'd just replace the drive.</blockquote>