The MMS does A Series MMSs have a Pictures share for photos similar to the Music share for music files. The Pictures share is also where the sample photos are housed (you can delete these at your leisure). The Music share is for content you'd like to add to the server manually without any synchronization client. It can be deleted at any time, at your leisure. Content stored in these shares is accessed in place and is not pulled into the MMS's internal file system so any changes you make to files stored there are detected by the server within 20-30 seconds and the internal database is updated.
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