I have the DIR-825, H/W Ver A1, and was using F/W 1.01, SharePort Utility Ver 1.14, w/ a Western Digital external hard drive connected to the SharePort. My laptop is connected to the router via a wireless connection and was running Vista Home Premium 64-bit. For the most part, I could get the SharePort to work, although often, it would disconnect me completely from the router, and I would have to power cycle the router to get a connection back.
I recently installed Windows 7 Ultimate on my laptop, then the SharePort quit working altogether. I had to upgrade the routers F/W to Ver 1.13NA, and the SharePort Utility to Ver 3.0. I like the user interface of the newer SharePort Utility, but the connection is COMPLTELY unreliable. In fact, I cannot complete a system backup of my laptop to the external hard drive because the SharePort connection will disconnect after about 1/2 hr, leaving the hard drive still working. While the SharePort still recognizes the hard drive, I cannot reconnect to it without first disconnecting power to the hard drive, to get it to quit running so the SharePort has a chance to reconnect, and I still also have to power cycle the router. Otherwise, when I try to reconnect, there is a constant cycle of connecting, then "did not disconect completely", when in fact there is no connection at all. VERY IRRIATING!! 3 attempts at a system backup, and I have yet to complete one of them. I haven't even had a chance to see if I'm able to transfer any other files (such as my pictures that are stored on the hard drive).
I have tried suggested settings that have been mentioned in other posts, but no help. I'm about ready to get myself an extended USB cable and connect the hard drive directly to my laptop, but that is not what I bought this router for - so I can have a WIRELESS connection.