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, but blank Musicards can be written to with a special driver hooked up to a computer using included software. The Musicard only supports MP3 format.

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