It sounds like you got most of the bases covered. I wonder if the power failure damaged the drive electronics somehow. I was going to suggest damage to the drive controller on the motherboard, but ruled that out when you said you tried it in another computer.
Another thing you can check for is to check the properties of the drive controllers in the device manager. If it shows the drive running in PIO mode, it needs reset to DMA mode. I'm not sure if you will see this setting on a sata controller or if it's for IDE drives only, but it can't hurt to check.
Yeah, posted this problem in couple of hardware forums as the last resort.
I am repairing pcs since 2001 & this is the first time I've faced such a strange issue. All diagnosing tools are saying the drive is fine, alas its not.
Already checked drive controllers. Since you've mentioned it, I've also checked them now. All 3 hdds are in ultra dma mode 5. (except optical drives which are in dma mode 4).
What the more stranger thing is, some dos hdd tools are showing no read speed slowness. When I was checking for bad sectors with a dos utility (via bootable cd) , it completed the test with normal speed. (like 50mib/s or so)
Something similar happened to me last year with transfer rate drastically dropping and that HDD is almost unusable now so backup your data while you can, as I suspect it is physically damaged. Not shutting down a pc in the correct manner especially during high activity can damage the seeking head of a drive I believe! If you happen to figure out a solution or an alternative fix I would be very interested!
Hmm.. thanks guys,
Yeah maybe physically screwed some drive mechanism . Good thing is there's no important data on it.
I am going to try low level format for a couple of times and/or hooking it up to my freenas server and try UFS in next week. Will let you know what happened. In the meantime, any news ideas would warmly welcome
What do you guys think about running pc 24/7 ? Is it ok with domestic hdds ?
(When I checked in samsung site, I saw that they measure hdd life time by disk spin up + spin down times. Not by the power on hours.)
I've run most of my computers 24/7 other than update reboots and hardware exchanges. I've had drives last 8+ years in some of these systems with no problems. Newer drives are faster, so you normally end up replacing a drive before it fails anyhow.