It happens from time to time, not every day. And it seems to happen to IDE 1 and IDE 2 which are my main back up and storage drives. My main drive IDE 0 is a Maxtor Ultra Plus 9 that does not seem to be affected yet, only my WD JB's. I'll change my cables and do further testing. They are in this configuration:
IDE Channel 1
Maxtor-master to
WD-slave
IDE Channel 2
DVD-CD-RW combo-master
WD-slave
Of course I keep everything backed up just in case there is full corruption. Sometimes I'll also get a parity error involving the page file for some reason too, which does happen to be on my Maxtor ( C: ). Could all be related I suppose.