reverend
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This is about the most technical information I've found on it yet (it's still basic but gives you an idea):
http://thinkwarenorthamerica.blogspot.ca/2015/05/live-life-hassle-free-with-format-free.html
Basically it's not a standard Windows file format so I'm guessing the viewer software must install a filesystem driver to stop Windows from wanting to format the card every time you insert it.
It doesn't seem to be in the Ambarella based cameras - only the Cortex ones so guess they've got their own filesystem filter driver on those and the Ambarella cameras are just standard FAT32 or exFAT (not sure which they support as it's SDK dependant but more than likely both).
http://thinkwarenorthamerica.blogspot.ca/2015/05/live-life-hassle-free-with-format-free.html
Basically it's not a standard Windows file format so I'm guessing the viewer software must install a filesystem driver to stop Windows from wanting to format the card every time you insert it.
It doesn't seem to be in the Ambarella based cameras - only the Cortex ones so guess they've got their own filesystem filter driver on those and the Ambarella cameras are just standard FAT32 or exFAT (not sure which they support as it's SDK dependant but more than likely both).