Originally Posted by Subzero11
The hard drive is held by plastic rails. So the bodycasing of the HDD is not touching the case after all. Power supply is grounded to the connector board on the hard drive so it may not be grounded as I thought it was. Also by the way the The PC was running at the time. Nothing happened to the PC still running fine I did not noticed anything diff. But still is some of my data corrupted ? Do you guys still think I have nothing to worry about and why ?
Even if the drive case was isolated with plastic rails, it IS still grounded through the PSU. If you look at the board on an HDD, you'll see then the screws holding the board to the drive screw onto metal pads, which are connected to the ground of the power connector. You can verify this easily with a multimeter which has an Ohms range. Set it to the lowest Ohm setting, then touch one proble on the case or a screw, and with the other probe, touch one of the GND pins. It will read as 0 ohms (or very close - some meters/probes usually add in a little variance, so you may see 0.5ohm or summat) And as you said the drive was powered up at the time, which means it would have travelled to ground through the PSU.
*EDIT - COM is the Ground, GND or "Common". Its all names for the same thing in electrical/electonic circuits.
I also think you have nothing to worry about on the corruption front. If you HAD zapped it, and the machine crashed cos the drive comms got zapped, THEN it may have corrupted files. But the fact that the machine didn't miss a beat means it is highly unlikely. Plus the SATA comms has error checking anyway, so if you had zapped a data packet, it would probably have resent it as it would have acknowledged an error. You'd have more chance of the whole drive dying, and then you would know about it. If you are still worried, you can run chkdsk on the drive, but really, you are overthinking this. It is fine. Chkdsk will give you peace of mind though. Static zaps tend to cause all or nothing failures, you tend to know pretty quick if a component has problems. Memory for example would cause bluescreens, memtest would find the fault. Drives would disappear if the board was damaged, corrupt files are far less likely.Edited by latelesley - 1/30/14 at 9:53am