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Actually, players that meet the BD-Live spec MUST have 1 GB of on-player storage--you can't "fudge" it by storing the BD-Live data on an external flash drive connected via the USB port.

My Sony player requires me to have a flash drive plugged in for BD Live. It's a couple years old, maybe this something new?
 
And the moral of the thread, OP, is to read the manual. If you don't have it, the manufacturer of your player probably provides it online at their website. Look under "Support" or "Downloads".

No one here can say with any certainty what the USB port is for, or how you can make use of it. Especially since you never told us the exact brand, model, etc. RTFM.
 
My Sony player requires me to have a flash drive plugged in for BD Live. It's a couple years old, maybe this something new?

My Samsung is the same. It did not support BD 2.0 when I bought it, it came later as a software update and needs the USB drive for the BD-Live storage.
 
It appears to be for playing media, but you can't just play any video files on it... I tried a .mp4 and it said 'wrong format'. So I guess I need to chuck a DVD/BluRay image onto the flash drive, so I can play the videos off that disk...
 
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