I know those thumb drives can be tricky to work with. In the menus are you sure it shows the option for the drive? (I think its the menu to the left of the main one)...I know when I set up my thumb drive, I needed to
-have the box on a channel
-power box off with remote
-power back on
-flip switch on back
-insert drive
-power back on
cuss a few times and repeat before it would accept it
The Western Digital HDD I have took to it no issues
-have the box on a channel
-power box off with remote
-power back on
-flip switch on back
-insert drive
-power back on
cuss a few times and repeat before it would accept it
The Western Digital HDD I have took to it no issues