I figured any IDE/PATA drive would work, haven't concerned myself with ATA-X specs--should I?
Will you buy some type of 44-pin to 40-pin adaptor to connect the drive?
Edit: I'd be more concerned by the connector itself than the ATA specification. I checked the image of the Hitachi drive on Newegg and it might work fine. Compare it with the connector on your current drive to make sure they are the same.