This device says "USB OTG" and "Card reader", but it's a little more complex than that (two sources for the same device, with slightly different descriptions):

http://www.compsource.com/ttechnote....vid=1447&src=F

http://www.directron.com/330100.html


It has a full host of card readers (CF I & II, SD, MMC, Memory Stick, Memory Stick Pro, Smart Media, Micro Drive, and XD (with a CF to XD adaptor). It has 2 USB A connectors for attaching USB HD's directly, and then, even without connecting to a PC, you can transfer files from disk to disk, disk to card, and/or (I think) card to card.

It also has a USB B connector to attach to a PC, so you can also use the device as a plain card reader.

That's what I glean from the description. It has internal power (3 AAA batteries), for use when it's doing non-PC file transfers. It seems like it'd be useful even if it doesn't exactly directly attach to the N810 ... Worst case, you could attach an N800 and/or N810 to the USB B ports, and treat them like dumb storage for transferring files around.

I might get one next month and play with it. If I do, I'll post back here about it.

Just googling "Aleratec 330100" found it at a few stores.