Memorex DVD-R 16x discs are CMC AM3 media code, and are only supported at 4x with the latest A105. Yeah, pretty lame! I picked up a spindle of Memorex DVD+R 16x discs which were Ricoh R03's and they burn very nicely and are supported at a full 16x. Burned in 5:36, PIF average was somewhat elevated at 0.69 but PIE avg was only 4.62. The CMC AM3 media is not very well supported at present.