I am having the same issue. I connected a Seagate FreeAgent Pro ext drive to the USB port on the router. The shareport utility sees the drive and is able to connect to it. But then on windows explorer the drive is shown as a local drive w/o its name, and when I double click on it, nothing happens.
router D'Link DIR 825 REV B, Firmware 2.05NA
I am very disappointed thisis not working as it was one of the main reasons why I bought this router.
txs for the help