Can a device have multiple logical units per target device?
The code in usbstor.sys does not make any assumptions about the number of logical units per target device. If it finds multiple logical units, the operating system enumerates each as a separate device. Refer to the KB articles Q324953 and Q316857 to find the Quick Fix Engineering (QFE) support for multiple logical units on Windows 2000. This QFE is also available in the Windows 2000 Service Pack 3 (SP3).