slotMusic was a brand of microSD[1] memory card developed by SanDisk preloaded with music in MP3 format.[1][2] They were first available at Wal-Mart and Best Buy stores in October 2008.[3] The current selection of songs comes from Universal Music Group, Sony BMG, Warner Music Group and EMI Music.[1][2] As of mid-2011, SanDisk's website lists a total of 14 albums available in the SlotMusic format.
The audio files contain no digital rights management,[2] and are encoded at minimum bitrates of 256 to 320 kbit/s.[2]
A slotMusic albums may also include high-quality images and videos in multiple formats.[2] The contents of each microSD card may be altered by the user, enabling them to add or remove files from the slotMusic card as desired.[2] Another type of card, slotRadio, was developed in 2009 which had radio-like controls. A slotRadio card had more restrictions on how it worked, such as not being able to backtrack to a previous song.
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