this drive is pulled from a simpletech enclosure and plugged in direct to computer as secondary drive.
symptoms: intermittent viability in windows device manager and bios, but will sometimes completely lock up windows (xp) no rattling, powers and spins up, no clicking.

I read in another post that problem is sometimes only a shorted TVS diode, but i don't know how to test for that. I do have a cheap meter, and soldering iron, if someone can get me in the right direction.
the full set of pics is at http://gbcomputersolutions.com/pics
here are the pics...
Pic #1
Pic #2
Pic #3
Pic #4

If it was TVS diode then the drive would be dead.

More than likely bad sectors.

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