It is an NEC/Optiarc drive; it's a 7200s. The firmware is Liggy's Plextor PX-820A Bitsetting Firmware 1.00. It installed just fine on my drive because apparently the Plextor PX-820A/S drive is a re badged NEC/Optiarc.
The official optiarc firmware wouldn't allow me to backup most of my DVDs. When I would try it would just lock the drive up. As soon as I installed this firmware it fixed that issue, but I just recently tried burning a DL disk and the programs I've tried say that there isn't a disk in the drive or that the disk is not blank and cannot be used.
There are so many different firmwares to choose from and I'm not sure which one would be best for me. Any help in deciding would be greatly appreciated..