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Run chkdsk /r once, and try again.
Or try with Diskeeper which usually works without any problems. Current free trial version is 2009 on their website and will run as a full featured version for a month.
Unlikely, but could also be a malware/trojan, if the CPU is at 100%. Wouldn't hurt to run a scan once.
Lastly, may want to check if the drive is alright. Has it downgraded to PIO mode?
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