I don't think a lot of people are terribly impressed with the quality of the Shareport (with it consistently working). I have the DSM-750 and the DIR-655, but I also have the DNS-323 (network attached storage device). The DSM-750 detects the networked storage device, but that has a UPnP AV server built in. With the Shareport, I think you have to install the utility and drivers on each device that's going to use it, so I wouldn't be terribly hopeful that you'll be able to use that to stream videos to your DSM-750. I think your best bet would be to use something like Tversity or PlayOn or WMP or Windows Media Center to stream videos to the DSM-750. You could still attach the WD drive to the Shareport (assuming that even works with the power consumption), but instead of going from the WD directly to the DSM-750, it would go from the WD to your pc to the DSM-750.