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I'd be interested in hearing how successful a UDF-formatted USB stick would be in the real world. I managed to find a discussion on superuser from 2009:

http://superuser.com/questions/39942/using-udf-on-a-usb-flas...

One fairly big problem you have here is that there are going to be zillions of consumer devices that expect memory cards and USB sticks to be FAT32 and nothing else.

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That really is the big problem. FAT32 won by being there at the right time.

Well, i just formatted my 32GB flash drive UDF, and no hiccups on mac or linux. The WDTV Live seems not to support it. Havent tested on Windows yet

I think the issue is not your computer, it's your camera and other random electronic appliances that support flash storage....

They tend to be very conservative about what they support, and have hard or impossible to update software.

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