Alas no, the problem seems to be on a much lower level - If I boot into DOS and put the disc in, my drive still sits there trying to read it
But I have managed to fix it!
Ironically, my old Lite-On 832S was the key - I tried recovering the disc in my Plextor 716A; No Joy. My LG; No Joy. My friend's Pioneer; No Joy.
However, in an act of desperation I hooked up my old Lite-On again and whacked the disc in - It still couldn't do anything with it, but unlike every single other drive I put it in, it didn't lock up trying to read it!
I quickly jumped into Nero and erased that sucker, and now it works again in my Plextor!
Guess I'll keep that Lite-On around - It may suck for DL burning and overall quality, but it seems it deals with crap discs better than any other burner!