The cassette tape. However, the cassette tape could offer a new way to store our ever increasing amount of digital data–with a biological twist. A schematic of the DNA cassette tape and a DNA cassette tape drive. (B) DNA cassette tape drive with completely automatic operation and file management system is used with DNA tape. A traditional cassette tape holds roughly 10 to 12 songs on each side, but 328 feet of this DNA cassette tape could hold the same amount of data in over 3 billion songs.