SlowOne - To answer your questions....
The turn DMA off thing. Frankly, I think you should try it before .. that advice isn't true for all systems and disk controllers. Under Windows 2000, mine updated fine with DMA on. Yes, they are talking about turning it off in your operating system (Win98) or your system BIOS. THe update program is pretty safe, it won't hurt your drive to try it...
Your second question... no, the drive is UDMA66 or UDMA100... I think it is just plain "UDMA" or "UDMA33" -- not sure which, I think (UDMA33). 1800K/second (12x recording) isn't that tough for UDMA, so don't worry too much about what controller you use. As for master/slave, you SHOULD consider putting your "source drive" on a different channel (controller) than the recorder... but with burnproof you are fine. I typically burn off my 100mbps network at 12x without problems
Personally, I put my burners on their on IDE controller (only device on that conector). CompGeeks and other places sell older Promise Ultra66 controllers for cheap ($20 or under) -- and these are very nice, as they do a great job of detecting the drive capability. I put my Ricoh 6x4x32 burner on my Asus CUSL-2 (Intel ATA100 controller onboard) and I had problems getting DMA to work -- hooked it up to my Promise and it gives you clear messages in the BIOS about the mode it is using -- and it worked at UDMA without problem. The promise also has TWO different IDE channels, I typically put my player (Memorex 48x too) on one, the recorder on the other.
I watch lots of streaming videos off my drives, so interuptions are BAD -- this setup works perfect.