List of defunct hard disk manufacturers

At least 223 companies have manufactured hard disk drives. Most of that industry has vanished through bankruptcy or mergers and acquisitions. None of the first four entrants continue in the industry today. Only three manufacturers have survived: Seagate, Toshiba and Western Digital (WD)—all of which grew at least in part through mergers and acquisitions.
Partial list of defunct manufacturers.
Some of the defunct manufacturers include: