I've searched around for posts on the infamous S03 error but haven't found anything that really points out how they come about. I'm asking because I just picked up a lifetimed TCD540 cheap where the owner had the error, got a pre-imaged replacement drive, and then got the error again within 3 months. I verified the error when I first got the box, pulled the drive and ran the WD long test (passed), then re-imaged the drive. After that it worked fine but who knows for how long. I also checked the caps in the power supply and they look ok. Is there some sequence of events that can corrupt the database on an otherwise good drive during daily downloads?