datafab.c has an often-seen bug: the SCSI READ_CAPACITY command
does not need the number of sectors but the last sector.

I just tried the CF and SM parts of a 5-in-1 card reader.
The CF part works with US_PR_DATAFAB when the bug mentioned is fixed.
The SM part works with US_PR_SDDR55.
(Revision Number is 17.08 - that in case the 0000-ffff
should prove to be too optimistic.)

We still must discuss what setup to use for readers like this -
I have several of them - that require different drivers for
different LUNs. As it is now one has to compile usb-storage
twice, once with CONFIG_USB_STORAGE_DATAFAB defined and once
without, and remove one usb-storage.ko and insert the other
to go from CF to SM. (And that hangs with 2.6.4 so a reboot
is required..)