The USB key as described above may advantageously be used to allow the participants of a meeting to share their respective presentation files by temporarily storing them in the “drop zone” of the USB key provided by one of the participants, for example the organizer of the meeting, or by a trusted third party. The confidentiality of the data shared by each participant other than the provider of the key is protected against the others because the “drop zone” appears to each participant as an empty memory space, possibly with information about the remaining available storage space in the “drop zone”. The USB key can thus be shared by several users who are not first-profile users, each of these users placing his or her data on the key without being able to see the other data stored therein when the key is connected to his or her computing device. The supplier of the USB key, having the first user profile, can then compile all the presentations in the “drop zone”. As explained above, the driver for the key may further be configured to delete data stored in the “drop zone” after a predetermined time and/or periodically.