I recently purchased a WD 150gb Raptor and a WD 250gb drive from newegg. From the start both drives for all purposes are performing fine, but the Raptor while idle will make a short noise indicating it's working and then back to quiet, when actively using the drive such as installing a program the drive will very audibly sound like it's working. I know people say that raptors are loud, but is this what they were talking about? The second drive was also working just fine, but just this morning when turning on the computer it failed the smart test. Would this be cause for concern? Should I consider RMAing either of these drives? Thanks for the advice.