Bus 001 Device 043: ID 152d:2338 JMicron Technology Corp. / JMicron USA 
Technology Corp. JM20337 Hi-Speed USB to SATA & PATA Combo Bridge
20mb/s write.

Bus 001 Device 040: ID 1b1c:1a90 (Corsair Voyager GT)
1.5mb/s

Differences in attached lsusb -v (pata vs voyager) seem to be...
iConfiguration          4 USB Mass Storage
iConfiguration          0
iInterface              6 MSC Bulk-Only Transfer
iInterface              0

Maybe the voyager is so slow because something isn't registering it a
proper mass-storage device?


** Attachment added: "lsusb -v"
   http://launchpadlibrarian.net/22620449/usb.txt

-- 
file transfers on USB disk are very slow
https://bugs.launchpad.net/bugs/197762
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