Newbie with a slow DW-D22A

I just installed a new SONY DW-D22A and was able to burn a music CD and a DVD using the latest version of DVD-shrink and Nero Express 6. A friend ask me to check the burn and read speed using the toolkit in Nero and I was getting less than 2X. I noticed that DMA is not enabled on the drive, but I don’t know how to enable it? It is on a P4 2.8GH with 512 MB of RAM. The drive is a slave with an older DVD reader as the master. Any ideas please?
I was using 8X media.

If you had looked litteraly a few posts above yours you’d have seen this

thanks, I will do it when I get home, I assume you think this will solve it?