clog: is there any limitation to the device/disk size the USB interface supports?
Not really, but we suggest a Portable Hard Drive rather than a USB flash drive, the USB devices are checked and scanned before being in use to help determine the reliability with the recorder functionality. a 32GB space is the recommended minimum as you have to allow reservation space and other unallocated data.
If the pre check scan shows that the drive is unstable, you can still record on it however don't expect it to work 100% all the time.