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Typically drive manufacturers have non-destructive diagnostics tools to test a drive.
search for seatools for a bootable DOS ISO that can test Seagate and Maxtor drives.
Then I would look into hardware issues with your controller, just to be ion the safe side. I have a couple 8 port SATA RAID controllers here that had a manufacturing hardware defect that cause drives to drop offline for no reason once two drive drop offline at the same time the array was destroyed. Took two years for the issue to show up on my system and I lost everything (thank goodness I had backups) The manufacturer had recalled the defective boards about 6 months after I bought mine, and replaced them for people that called in. The manufacturer didn't notify anyone directly (So tell me why I should bother registering my products again ?). so I never saw the recall notice. Grrrr. I still have the two new Replacement controllers sitting here in my office. I had a spare controller on the shelf in case of failure, but the spare was the same hardware version as the original. After loosing a 2 TB array I've been a bit leery of using them again, even though the issue has been addressed. The point of this little tale is that there could possibly be a hardware defect in the controller you have, and unless you do some searching to find out, no-one will ever notify you.. Why should I care, I didn't need that SQL Server anyway.. it only contained the Database for our ERP system..
On the up side, it finally got management to pry open their wallet, and allow me to BUY decent servers instead of forcing me to piece together whitebox franken-servers out of off the shelf parts..
Best of luck tracking down your phantom issue.
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