I bought a Buslink DVRW412RD because it was cheap and several folks were saying it's a lite-on DVDRW LDW-411S. It is a lite-on, and Zebra's mod works perfectly on it to upgrade to 811s. Thank you thank you.
BTW, I had read a lot of comments advising uninstalling Intel Application Accelerator before doing any mods or upgrades. I took a chance and did not uninstall it. On my system - p4 1.6, asus 4b266 mobo, win2kpro - IAA caused no problems. I haven't burned any dvds yet, so we will see.