Share your experience!
I have a PCG-GRT996ZP with an optical Drive DW-U54A, Firmware 1.5a. Unfortunately i can only burn 4X DVD media, which will be no longer produced. Have already Problems to get 4X Media.
Maybe it is a good idea to have a look in this forum:
http://club.cdfreaks.com/forumdisplay.php?f=44
For what I have heard the drive is a Lite-on and the boys in that forum can "upgrade" these drives.
Good luck
Have a look on VAIO-Link, don't use any unofficial firmwares as you can damage your drive and Sony won't cover it.