if both drives are showing up, but not accessible, it's very strange. Looks like both modules are loaded properly and 2 LUNS are exported to USB host, but no partitions are exported as LUNS targets.

Could you, after connecting device to desktop (and ensuring that two drives show up), try to run this piece of code in N900 (as root), line by line? In case of errors after any line, write it here.

After both modprobe -r, drives will disappear from desktop - it is normal. One will re-appear after modprobing again, but still inaccessible. Final command (echo'ing) should make MyDocs accessible. Remember, /dev/mmcblk0 is *not* a typo, in this case, it should be like that, *not* mmcblk0p1.

Use auto-completion for path in final command, to avoid typos - I've written it by hand, so could do some typos, too (although checked it and wasn't able to spot any).

If all commands return no errors, but mydocs is still not accessible, it is really broken hardware'ishly, in some strange way (unless state of system on that device is total fubar)..

/Estel