They are the different protocols applied by the player to connect to a PC.
The player allows the access by a PC through USB Mass Storage Class (MSC), or Media Transfer Protocol (MTP).
The MSC mode allows the player to work as a drive.
The MTP supports the transfer of music and video files to portable audio or video device. It also allows music and videos to be converted to playable formats during synchronization to the player through Philips Songbird or other media management software.
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