Since accepting the most recent update of USB Control, my N810 now recognizes and reads from a SanDisk Cruzer 16GB flash drive. I haven't tried writing to the drive. The N810 did not recognize this drive prior to the USB Control update.

A 32GB drive of the same type is also recognized.

Unfortunately these are obnoxious capless flash drives, which retract the USB connector into the body of the unit, leaving the connector's innards vulneralbe to pocket fluff contamination.