The more I search this, the more confused I get.
I have a WD20EARX that was used in a PVR for a while, and a couple of days ago I shifted it into a PC. "Raw Read Error Rate" data was at 0 to start with. After writing about 1.5TB to it I happened to notice that the data value is now 3. What does this mean? I have a couple of other WD drives in the PC (one a system drive, the other for programs), and as far as I know the "Raw Read Error Rate" data value has never changed from 0.