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MP3 players Clip Sport
2

Here is a link to an idea I posted on the SanDisk Forum about creating a Playlist for all music files on a micro SD card.

http://forums.sandisk.com/t5/SanDisk-Clip-Sport/Simple-Batch-File-for-Playlist-of-All-Files-on-Micro-SD-Card/m-p/358961#M3534

This method will not allow simultaneous access to music files in the internal and micro SD card memory.