80 gb hdd is much more healthy than i expected. good old days lol
all the hdd have quite high temperature. it may do damage to hdd for sure , and probably the reason for your problem.
make sure you have a good ventilated case.
make sure your hdd is not stacked up.
make sure to install some front fans. if your cabby is not really good at providing good air flow, get a good one with some good fans.
always keep an eye on those two hdd with yellow color(look at those values and see whether they increase rapidly). that seagate 500gb can fail any time soon. make a back up.
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also hide the serial number