Thanks everyone for your replies. Sorry for my postponed reply. Viper5700 - I can not reset the learnt media, even with “unscrambled” firmware. The EEPROM utility reports invalid eeprom file. I believe this has to do with the sum check on 1635s and why omnipatcher does not (yet, hopefully) work.
Hall and HenryNettles (hello again!) my device manger was showing DMA 2 for the 1635S and DMA 5 for my HD. Yeah all other three spots are taken by HD’s (200+300+200) I made sure the third drive is relatively idle (no programs on it, no pagefile, cache etc.). I DO have a MoBo more than three years old (Intel P4 1600 i845 chipset) - I am wondering if it is time to replace - although my PC it is sufficient at everything else (except games - but I have xbox, xbox360, PS, PS2, Nintendos, etc.).
If you saw some other posts of mine, I had taken off Intel Application Acelerator. I put it back on, and now my Device Manager reports DMA 4 for the Litey… I guess thats better although CD speed create data disk still literally lost communication with the drive near the end of the burn. Last night I was thinking about where it drops communication and saw it corresponds when the drive ramps up to a little after 14X. (As HenryNettles suggested) I tried burning at 12X (see below) and at least (only tried it once) it completed OK - but disk quality looks bad in the middle and transfer test looks horrid. There are no bad spots on scan disk though.
Probably as you guys suggest it is just bad media and I have to slow it down (even more). I had similar problems with other drives, and other media (Phillips - see other link above). Why - if it is subpar media) would Liteon put 16X in the media codes? Why don’t they downgrade to 12X or 8X?
HenryNettles, the first two pngs show the DVD+R - first burn with newly replaced drive. the next three pngs are some attempts ant Create Data Disc after BT was set to DVD-ROM. the last two are from the Create Data Disk using the Kypermedia 4X DVD-R media (TDKGO2000000).
ALL YOUR HELP IS GREATLY APPRECIATED! - I’ll try some different media (since you mentioned it known suboptimal media) and try different speeds. My old 451@832 when it worked gave great burns - but now dealing with 16X. Maybe won’t have to spring for a new PC yet (?).