Hi, I have a raid 0 striped array set up using disk utility (software raid) that I have Mac OS X and all my files installed on, it consists of the stock WD 640gb caviar blue drive and a WD 250gb caviar blue drive. Lately I have noticed that after cleaning my hard drives and reinstalling them the 250gb is reporting 55 degrees celcius temps at startup and after some photoshop goes up to 67! is this normal should I be worried? What should I do? Could it be a faulty temperature sensor?