Musicard

The Musicard is a music format that was introduced by Theorysonic in 1997, but did not make it onto the market until 1998. The format is a standard flash card format, measuring 3.5 by 3.5 cm in diameter. The cards can only be read on dedicated players, or through a driver hooked up to a computer. Musicards only support MP3 format when writing to them.

The Musicard was exported and marketed in the US as the Theory Musicard by SanDisk. As of 2019, the Musicard continues to be manufactured and sold, albeit to a niche market.