List of defunct hard disk manufacturers

At least 218 companies have manufactured hard disk drives (HDDs) since 1956. Most of that industry has vanished through bankruptcy or mergers and acquisitions. None of the first several entrants (including IBM, who invented the HDD) 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.

Manufacturers
The following is a partial list of defunct hard disk manufacturers. There are currently  manufacturers in this incomplete list.