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I ran HD Tach today to test out my RAID-1 drives (400GB SATA WD drives), and during the sequential read test I get odd results. It starts progressing and than I hear a loud "click" come from the case. The test pauses, and begins to progress again after a few seconds. A hear a few more of these along the way.
End result is something that looks like this.
End result is something that looks like this.