A CD-ROM that is cut into the shape of a business card after manufacture. Although variations of the full-size 120mm disc may be used, business card CDs are often cut from the smaller 80mm mini CD format, which fits into the center well of the drive tray. Depending on shape, they hold up to 150MB of data. See mini CD
and custom-cut CD
Business Card CDs
Note the difference in size to a regular CD. Business card CDs are usually shaped for the inner well of the drive tray.