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PostPosted: Tue Jan 29, 2013 12:15 am 

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I had a very strange event happen today with one of my WD Caviar Black 1TB drives in my home-built WHS system.

The WHS icons on my systems turned yellow and I went into the WHS console to see what was up. WHS was reporting that this drive had a high reallocated sector count, had one sector that was pending reallocation, and the drive was degraded.

My Home Server SMART plug-in was independently reporting the same problem with this drive. So I started the drive removal process (i.e., it copies the files off the drive in preparation for removal) and I got a Machine Check Exception x'9c' about an hour into the process.

I rebooted and restarted the removal process and it completed normally from what I can tell. I then moved this drive to a Win 7 system and guess what - the S.M.A.R.T. reported no problems at all. I ran WD Data Lifeguard extended check and it reported no problems. I then formatted the drive and it formatted with no issues. S.M.A.R.T. shows zero reallocated sectors.

I then went back to my WHS (without this drive installed) and ran Prime95 for 3 hours, then Memtest 86+ for two hours, and no problems were reported. The power supply voltages are showing stable normal values.

The mobo is at least 5 years old, the power supply is 3 years old, and the system has been running 24x7 for most of its life, although it has always had stable, conditioned power (connected to a UPS) and has been kept extremely clean. It has never had a hardware issue before now.

I'd like to put this drive back into production but now I'm spooked. I've never heard of S.M.A.R.T. values behaving like this.

Any ideas what happened?



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