it SAYS it lasts 10 hours...now half that, and that's probably close to what you'll get in real life...
they test it w/ no backlight on, volume at zero, etc...it's a joke...my rio 500 can allegedly play 13hrs straight of a single AA battery...can i realistically get that? - hell no..
ask any laptop user how much battery life they can muster out of their batteries.
as for the 30mb buffer, u're then saying that it has 30mb of ram (or flash) onboard?? - that might be interesting...it's also interesting to note how much power it takes to initially spin a drive up, then having it nearly idle for 30min...
the product is nice, but i still don't like the idea of a mobile hdd....or proprietary battery packs....