I have an IOMagic-branded black Dual Digital Storage drive (40x CDR, 8x DVDR, 7 in 1 card reader) which I think is a BTC-made 1008IM.
This is the 4th such drive I bought, the previous three all were returned to Fry's within a few months of being bought due to all three no longer reading/writing CDs, just like the two previous BTC 1008IMs DVDRW drives I had.
My current IOMagic DDS drive always gets kicked into PIO mode. Every few weeks/months I have to remove the IOMagic and put an Asus CDROM in its place, then boot up the computer. Then I have to turn off the computer and reinstall the IOMagic to make the IOMagic DMA mode again.
I know there were double layer Dual Digital Storage drives marketed as both BTC and Emprex, but I never did see any of these in US stores. The only ones I've found still for sale are from obscure British computer sites.
If anyone knows of any stores in the USA (online or B&M) that sell the double layer Dual Digital Storage drives, please let me know.