I wonder if anyone with technical knowledge can help with this please. I'm interested in understanding the process used when a recording made on the HDD is copied to a DVD-R on a HDD/DVD recorder. I have a Pioneer DVR-420HS and the manual says (P.61) "Copying between DVD and HDD is a completely digital process and therefore involves no loss of quality in the audio or video". What it then goes on to say suggests that this is the case in both directions of copying (so applies to HDD to DVD copies). The reason for asking is that I have encountered problems with playback close to the end of some Video mode DVD-R copies, in the form of frame skipping. The disks have 2 characteristics - they are nearly full (content length close to disk capacity) and they were created using fast copy. The titles were recorded in SP mode on the HDD and fast copied from the copy list. The content running time is 1:58+ ; the disk should take 2:00+ at SP. The problem is not there on the original HDD recording and when I re-copied the same titles to individual disks (so the DVD-Rs are only half-full), they played right through just fine. Also only some disks with these characteristics (fast-copied, nearly full) have the problem; others are fine. No disks that have reasonable space left when finalized have shown this problem. I have not been able to try real-time copies of the titles to a single disk as I stupidly erased them from the HDD before I thought of that test (though after I'd put them on separate disks)! The problem copies are on Verbatim 8x DVD-Rs, "supported" according to the manual. Anyone else seen this problem or similar? It raised questions in my mind. In spite of what the manual says about the copy process, when is some form of digital processing (re-encoding) involved in the process? It would seem this must be the case in Optimized Mode copying and may be the case in other real-time copying but how could it be the case in fast copying? So this could be a media problem even if the media is "supported", but it would also seem to be content-dependent since other fast-copied and equally full disks are problem-free. Could the problem occur in finalization? (I didn't play the pre-finalized disks). Any technical person / engineer out there throw any light please?