I have a 1 TB WD1001FAES (SATA, 7.2kRPM, came as pre-installed component on a Dell XPS 9100) that I suspect has a PCB failure b/c it would not power up but had not shown any signs or made any noises to indicate physical damage. Before coming to this site and seeing fzabkar’s helpful posts on TVS diodes, I tried the following:
I swapped the PCB on the dead drive for the PCB on a 1TB WD 1002FAEX (the current version of the 1 TB Caviar Black and visually an exact match to my damaged PCB). With the new PCB, the drive spun up and Windows could tell there was something there (ATA device and generic disk drive) but could not read the drive in any way. [I now know from fzabkar’s posts that this is b/c the PCB swap is not as straightforward as it appears].
So, it appears if I can get the PCB board working again, even temporarily, I may be able to recover the data on the drive. There have been numerous posts about TVS diode failures, but my expertise is not enough that I can transfer that knowledge to find these diodes on my PCB.
Here is a picture of my PCB: http://img713.imageshack.us/img713/8254/img3027sg.jpg
Any direction you all could provide would be most appreciated. Thank you!