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Hello i want to write a usb flash disk driver, and now i?m searching the docs , i have already the docs for usb programing interfaces 0 ,10,20 but this docs don?t explain
the protocol to use with the external device, i think is somekind of scsi protocol ,but threre are many scsi docs.
where are the other required documents?

USB flash disks use the SCSI RBC (reduced block command) set. It's pretty small and easier to support. Others (I think) transport ATA data (which could be ATAPI again).