Why is DJ playing up now, when previously I had no problems?

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Cheers for replying.

My CD-RW drive shares the IDE cable with my DVD-ROM drive, I'm not sure which is master and which is slave (I wonder would that make any difference?). I've got two hard drives (both connected to the same IDE), I wonder would it matter which one the .cdi file is on?

I have no idea about the buffer size of the writer. This will most probably sound silly, do CD burners have onboard memory? I thought they used memory for the buffer from the hard
drive? (as you can tell, I'm not naturally gifted when it comes to computers!) Like I said I've got two hard drives, so maybe it would be best if I had the .cdi files on the primary one?

I've tried closing down practically all programs and still have the same problem and have had loads of programs running on different occasions when I've had success at burning a game.

It's not just the "buffer underrun" errors that are the problem, I'm also getting errors messages saying things like "illegal parameters.." etc which make me think that maybe there might be a problem with the actual .cdi files itself.