Thanks for the detailed response.
I have flashed my BenQ back & forth between G7xxB7P9 >B7S9>G7XX>B7P9>47L9 in that order & so forth. My BenQ burner(s) seem to function fine. Most of my flashing was done internally on an IDE channel, the last to 47L9 was on USB.
What app. are you using to scan your burned discs with?
CD Speed 3.42 works fine for me.
I did discover that DVDInfo Pro would not work with my external drive no matter what my BenQ firmware, if I was trying to scan over FW. I have a post in DVDInfo Pro Forum regarding this. As I can scan with Nero CD Speed (Nero Suite) or with CD Speed stand alone app. over FW, I quit worrying about it. I could/can run DVDInfo Pro as well as CD Speed scans, over USB.
When you were looking at your Prolific chip, did you notice if there was an A, B or C displayed in it's ID string?
I remember reading about someone else having an OXxx type chip ID and also was unable to upgrade??? Perhaps I can find the thread and see if he found a solution. It may be that you have an A version which requries a hardware device(?) to flash the chip,
The reason I asked about your OS, was that my PC's ability to recognize my external cases went south (intermittant system recognition over FW) when I upgraded to XP SP2....That was my reason for upgrading my Prolific firmware. Once upgraded, my external cases were recognized consistantly, again. This was only true when I was connected via FW (always recognized when using USB). If you are not having this problem & your BenQ is recognized by your system over FW, then I would say not to worry.
If your Prolific chiset is newer than the A, B, C versions, then perhaps the External case will not have delayed write problems with hard drives installed in them. If you do not intend to install a hard drive, then again, no worry.
Hopefully, I answered some of your concerns. Let me know.