To all of you who want model of USB floppy drive found working with 8790 for installing Promise raid driver. I found one cheap drive from staples in canada. After opening the Box, i found it be Teac FD-05PUW. I think the floppy dirves which are compatible with USB 1.1 seems to work here. Later I bought this model quite cheap on ebay (around US $ 32 with shipping).