No, it's not. That was all I could think of at the time though.
Heres a few more suggestions. I don't promise that any of them will work & I strongly recommend you backup everything before trying them, just in case. They are listed in no particular order, so just try whichever ones you want.
1. Try installing SP2 if you haven't already done so, plus any other relevant updates or patches. (XP is notoriously twitchy with optical drives so I wouldn't be surprised if MS have released a bug fix or two by now)
2. Download the latest driver/firmware from Benq's website. (As i said earlier, windows does not require a special driver for CD/DVD drives in order to recognise them & use them as readers, the drivers are used by the burning software. However, it may be worth a shot I guess)
3. Uninstall/reintsall (both in software & physically) one or both of the optical drives. If you do this, you ought to boot into safe mode when the drives are removed, and delete any ghost entries for them in device manager, before reinstalling the drives
4. Uninstall/reinstall the burning software
5. Run XP recovery console