Irwin Magnetic Systems, Inc., also known as Irwin Magnetics, was a computer storage manufacturer active from 1979 to 1989 and based in Ann Arbor, Michigan. It was founded by Samuel Irwin in 1979 as Irwin International, Inc. The company's primary export was magnetic tape data storage and backup systems for personal computers. Irwin was one of the first companies to manufacture quarter-inch cartridge (QIC) systems for the personal computer market. In 1989, the company was acquired by Cipher Data Products.

Cipher Data Products, Inc., was an American computer company based in San Diego, California, and active from 1968 to 1992. The company was once a leading manufacturer of magnetic-tape data drives and media for minicomputers, becoming a pioneer in tape streamer technology in the early 1980s. In the late 1980s, they also briefly manufactured WORM optical discs, through a joint venture with 3M. In 1990, they were acquired by Archive Corporation for $120 million.