The Exatron String Floppy was introduced in 1978, and was an endless loop tape cartridge system for microcomputers. At the time, floppy disk systems were still expensive, and cassette tapes were very slow. Despite the name, so-called stringy floppy systems are unrelated to floppy disks.
The tape cartridges, called wafers, contained a 1/16-inch loop of mylar-based chrome dioxide tape, in different lengths according to the capacity of the wafer. The smallest wafer contained 5 feet of tape and could hold 4 KB of data, and the longest was 75 foot and, capable of holding 64 KB of data. A 16 KB file took just 24 seconds to load.
The Exatron Stringy Floppy system was most commonly used with the TRS-80 range of computers, and did not require an expansion interface. By 1982, the price has fallen to $99.50. As well as being used to save data, software, including programs and games, was available on Stringy Floppy wafers.
Although popular with TRS-80 owners, the system could be unreliable, and as the price of faster and more reliable floppy disk drives fell they became less attractive. They continued to be advertised until 1986.