So far I have had no issue with using SATA 600 drives on any machine. There is no difference in the connectors so if the rest of the mechanicals are OK then you're fine.
It's odd to see drives die in our office. Is there some reason you can think of for the early death?
I'm new and uninformed I have been doing research online to figure out which hard drive would be best for me to upgrade to but the information out there is kind of confusing to me. I had a Seagate Barracuda 500GB 7200.11 3/Gb SATA/300 but it died and I'd like to upgrade to a larger capacity hard drive maybe Seagate Barracuda 750GB. The thing that confuses me is that the Seagate 750GB is a SATA/600. Will it be compatible with the system I have? Basically, can a SATA/600 fit where a SATA/300 used to be? I would appreciate any help and or suggestions.