Abstract: A flat electronic storage medium, in particular a USB memory stick which has a fastening facility. The fastening means (1) is integrated into the housing (2) of the storage medium in that the housing (2) has a slit through-opening (3) or a lateral hook-shaped housing extension (11) of a flat side of the housing, the hook end (12) of which extension forms a slit (4) with the housing (2), and each slit of the slit through-opening (3) or slit (4) can be closed off by a pin (5) arranged in a guide (6) such that said pin can slide in the housing (2).