(1) I have a DVD that was burned at 4X on Plextor PX-712A. I did a Q-check PI/PO test using PX-712A as reader and max PIE was 64 with 0 PIF's. The disc reads fine in the PX-712A, but when I put it in my BenQ DW1620, the light just blinks, as if it cant determine what kinda disc it is. After about a minute the light stays on solid and Windows XP just sees it as a blank CD. In PlexTools checking in the DW1620 it recognises the disc as DVD-R with correct volume ID etc, but NO sessions listed. There is 1 session listed if i put it in PX-712A. The media in question is the "DataWrite Classic Grey Top 8X DVD-R" with FUJIFILM03 dye. I thought the BenQ is not compatible with this particular disc, but it cant be that as I have another disc thats the same media type, burnt at 8X on PX-712A, with 400+ PIE's, and 4 PIF's as detected by plextools using PX-712A as reader. This disc is seen by the BenQ no problems! What is wrong? Im thinking i have faulty drive(s)?
(2) Another problem I have is one of the 2 BenQ drives perform really slow when doing a disc quality test using nero cd speed. it often reads at something like 0.08x. My other drive is ok, reades at 8x roughly reading the same disc. CD speed Software is set to read at max speed, DMA enabled.
(3) Yet another problem I have is where the BenQ has burnt a disc at 8x (same media as above), used CD-Speed to check disc quality using Benq as reader - very low PIE's with no PIF's, files read back ok. However, if I then put this disc into the PX-712A, it cant read it! I can hear the drive spin up and down lots of times, but thats all it does. Can these drives read each others discs sometimes or what? Really weird problems these.
Any help would be appreciated. thanks in advance.