Yeah, I just plugged in a USB3.0 flash drive and looked in my network (on my Windows desktop) and there it was. It was just a quick experiment but I noticed it was exceedingly SLOW 
I got about 3MBps transfer rate. I vaguely remember I mentioned it on a forum somewhere, either here or a TP-Link one(?) and got a response that that was all the WD TV SMP could acheive. The modem was an N600 with a few devices hanging on it. The flash drive was capable of 80MBps “Read” and 50MBps “Write”
Just out of curiousity I JUST tried it again. This time on a 3200AC tri-band modem. I copied a 4.3Gb file to the same USB3 flash drive and got about 6MBps (peaked at 6.6MBps). The transfer took about 13 minutes to complete. So double the speed I got on my old modem so , at least, that proves the WD TV SMP IS capable of more than 3MBps 
To tell the truth I haven’t used my WD TV SMP much lately. I tend to use the media player on the TV. It is the horrible DLNA setup but is one less device to switch on. I was impressed with the TV though 'cause, with “Sync” it allowed me to use the TV (Sony 70W850B) remote to control the WD TV 
The path to my USB3 was/is "\Wdtvlive\disk-0". I had to access it through - Network (WORKGROUP) - Wdtvlive (WD TV Live) - disk-0 if it is any help.
It didn’t take any setup from the SMP nor the desktop. 6MBps is too slow for my liking so I won’t use it.
Another reason I use my WD TV less is because it got too slow to play BIG 3D movies, there was buffering but I don’t know if that was the N600 modem???
I had to go back to 2.01.86 (from 2.02.32) and had to do a reset to factory and lost the “Sync” facility. Again, don’t know whose fault but I suspect the old firmware doesn’t “Sync” as well and I can’t use the TV remote any more 
I had other problems but disconnection wasn’t one of them. I have watched, literally, hours (8?) of movies from the WD TV without any disconnection. In fact, I probably NEVER had a disconnection from my WD TV 
Anyway, hope I helped you make a decision 