Compatibility
Shaped CDs are not compatible with all CD players. They work with most machines where the disc is inserted by manually clipping it onto a spindle (the mechanism in virtually all portable CD players), but may not work in drives that load the disc from a tray, or those that pull the disc into a slot. They can even get stuck in these players.
Business card CDs or shaped CDs can hold any type of data and can usually store anywhere from 40MB to 100MB of information. These CDs may be used for promotional pieces for business, music or many other uses.
Read more about this topic: Shaped Compact Disc