I have for the past few years been happily using a Panasonic DMR-50 DVD Video Recorder to record TV programs on to RAM discs, which I then load into my LG GSA 4082B DVD reader/writer, and use the DVD-MovieAlbum Copy Tool to extract/copy individual recordings to my PC's hard disc - and then later I produce DVD-R's of selected recordings, which can be played on any DVD player.
In the past week or so my LG 4082B has had a problem reading the RAM discs, and tells me to insert a (UDF 2.0 format) RAM disc when there is one already loaded. Then if I put the RAM disc back into the Panasonic Video Recorder it says the RAM disc is Unformatted (i.e. it thinks it's corrupt).
The DVD RAM is OK before it's transferred from the Panasonic to the LG - I can edit out adverts from TV recordings etc, and play the edited clips, so it's not the Panasonic that's "corrupting" the RAM disc.
Just to confuse me even more, the LG DVD unit will still read DVD-RW and other formats of disc that I've recorded a while before this problem appeared - it seems to be just the RAM discs that are unreadable / being corrupted.