Problems creating 1:1 copies using Nero

[Sydney2K]

I've just updated my copy of Nero to 5578, but I am having problems trying to burn a 1:1 copy of disks. Even though I have increased available memory for Nero, I keep getting buffer underflow errors. Last time this happened it went through the simulation OK but when it came to the actual burn it got 60% of the way through the disk and died. I can't even do a multi-session burn session without it dying again.

Now, I've taken all precautions (unloading resident applications in memory, defragged the drive where I do burns, turned off screensavers, no multi-tasking.)

What I can do is burn VCD's and this leads me to a theory, that I can burn VCD's because I am burning Track at Once, not Disk at Once. When I try to burn a multi-session disk the problem comes up because I am trying to burn DAO.

Are there are tips, ideas or solutions I can try that anyone would like to suggest?

I have a Pentium III 650 machine, 315 M/b memory, and using a Diamond Data 4x4x32 CD/RW drive. HD is 50K speed.

Thanks in advance,

Sydney2K