first, perform a complete backup of your entire system
make sure your sata cables are tight, and cannot be pulled off with minimal force,
make sure there are no bends in the cables greater than 90 degrees, and that the sata
cables are far away from 12v rail power leads, and that they are not cable tied or bunched
with any other cable inside the unit,
visit the hard drive makers website and download diagnostic software for each HDD
make diskettes and peform extended scans of either HDD,
try to get a manual and see if the drives need jumpering because of possible speed issues
with the sata controller on the board,
if the drives are stacked too close together in the drive bay, they can get too hot
to operate, some drives have a thermal cutout, but more often than not data is corrupted
anyway,
disable write caching in the HDD properties in device manager, particularly if the pc's
power management policy turns off the HDD after a certain amount of time,
It's possible that there is nothing wrong with the drive physically, just that the
partition and operating system on it has reached it's 'half life' and it's time to
del the partition and reformat anyway, this should really be done with every hard drive every 2 years.
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