Unable to record full speed on some DVDs



I have the NEC 2500 8x recorder and can record at full (8x) speed on TDK, Fuji and Sony disks. However I recently bought 15 packs of Memorex and Philips 1x-8x disks at Office Depot and cannot record faster than 4x. I have tested these disks with DVD Identifyer and they do check out as 1x-8x disks.

Any thoughts as to why these two brands will not record at full speed?



Sounds like the limits placed on the medias record speed by the firmwares reading of the MID codes on the discs-

This may be solved with a firmware upgrade or not IMO-