I just checked the manual for a DVR-530, the first to get USB type A and USB type B ports in the US and Canada.
It states the USB type 'A' is for keyboards, cameras and flash drives and is located on the front next to the firewire port.
It states the USB type 'B' is for pictbridge compatible printers and is located on the rear next to the fan.
Pictbridge as I recall was a printer that could 'browse' and select JPG or other pictures on a camera or other USB device in order to "print" them.
This makes sense in the way that USB type 'A' is used when 'hosting' or 'using' a device and USB type 'B' is used when 'servicing' or being 'used' by a device.
It doesn't rule out being used as an 'Editing' port.. but its a simpler explanation for the same effect as far as what they were used for and why they exist.
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Last edited by jwillis84; 6th Jan 2019 at 04:30.