I have recently rebuilt a machine (Compaq 1.8, nvidia GeoForce; 2 hard drives - 40 gig (hda1) and 160 gig (hdb1)) from a R4v3 (old build that had been upgraded over and over from the original KnoppMyth) to a fresh install R4V4 with new nVidia drivers (NVIDIA-Linux-x86-1.0-6111). Everything went fine BUT a strange problem occurs... If I use hdb1 to store my tv recordings, I get the following errors:

2004-09-01 18:29:08 Scheduled 2 items in 0.028485 seconds.
2004-09-01 18:29:08 Started recording "2 WBTV" on channel: 1002 on cardid: 1, sourceid 1
2004-09-01 18:29:08 Changing from None to RecordingOnly
VIDIOCSYNC: Input/output error
VIDIOCSYNC: Input/output error
Can't read vbi data
Can't read vbi data
Can't read vbi data
Can't read vbi data
2004-09-01 18:29:58 Changing from RecordingOnly to None
2004-09-01 18:29:58 Found changes in the todo list.
2004-09-01 18:29:58 Scheduled 2 items in 0.00799 seconds.

The result is unusable... If I record it on hda1, everything works fine.

Any suggestions?

Presumably you're mounting the second drive over /myth/tv right? Double check the ownership and permissions of the resulting directory. It should be something like this:

Oh, and don't forget to check the hdparms to make sure DMA is enabled.

Thank you tjc. It turns out my hdparms were off - I had forgotten to update /etc/init.d/bootmisc.sh and the settings were being reset... That cost me several hours...