How to transfer file to internal usb storage on Samsung Note?
For transfering files thorugh pc to USB:
Goto settings>about phone> and tap build bumber several times until it shows you are now developer.
Now goto settings> developer options> enable debugging mode.
Now try connecting to pc  (Make sure you have USB drivers installed).

For transfering files from phone to USB:*
Make sure you have working otg cable.
Use es explorer(recommended) to copy paste the files from phone to USB.