Powered USB port - p/n question

[admsteiner]

Hey,

I'm putting together an X40/X41 spec list for a laptop sale at my law school. I recall someone mentioning that there is an IBM cd drive that connects via the powered USB port, bypassing the need for an X4 ultradock.

Does anyone have the part number for that? Preferebly for the DVD-ROM/CDRW combo version.

Thanks,
Adam