O'Reilly NOOK Manual page 299

NOTE
side loading
Transferring files from your PC or Mac to your NOOK is sometimes called .
After you've connected it to your PC, launch Windows Explorer. Your NOOK
now shows up as a removable disk, just like any USB drive. You can now use your
NOOK as if it were any USB flash device—copying files to and from it, creating
folders, and so on.
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TranSFerrIng FIleS BeTween Your nooK TaBleT and Your CoMPuTer