4GB USB hard drive
 

This looks interesting (excuse the odd translation!):

http://www.google.com/translate?u=ht...&hl=en&ie=UTF8

"Worldwide smallest! The super small-sized USB giga memory which used 0.85 inch HDD!"

It's a 4GB USB drive. With the USB power hack that might work well with the 770.

Looks like someone took iPod nano memory and removed the "iPod" part ;)

Yes, I'm pretty sure this would work. In fact, I could make a cigarette-pack sided case that plugs directly into the 770 with this thingy inside. But what would do with all that data?