Ok, so previous discussions on PS3 PlayTV stuttering have suggested various solutions but as far as I'm concerned the jury is still out on what fixes this problem.
I have the early PS3 with 80GB drive. PlayTV would stutter and became worse as time went on. I did a full format (the long version) and things improved, but didn't go away completely.
I researched other users and found that some people have a Western Digital 320GB drive and have no problems. So I bought the WD3200BEVT drive and initially thought I'd solved the issue. Even playing a game while PlayTV recorded seemed ok. However within 3 weeks it has started stuttering worse than my original drive. For instance, I watch a recording (which has no stutter) while recording another channel and it starts to stutter every 10-15 secs repeatedly. It settles if I stop the playback and restart, but then it starts doing it again shortly after.
Obviously the hard drive heads are busy recording data to one part of the drive while reading data from another location. Presumably over time the drive gets scrambled and the heads start to fly backwards and forwards as fast as they can. So is the answer to get a data transfer rate that can cope? What experience do other users have?