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Continuously improved, HDDs have maintained this position into the modern era of servers and personal computers.

More than 200 companies have produced HDDs historically, though after extensive industry consolidation most current units are manufactured by Seagate, Toshiba, and Western Digital.

Later models of removable pack drives, from IBM and others, became the norm in most computer installations and reached capacities of 300 megabytes by the early 1980s.

Non-removable HDDs were called "fixed disk" drives.

Motion of the head array depended upon a binary adder system of hydraulic actuators which assured repeatable positioning.Instead, the first models of "Winchester technology" drives featured a removable disk module, which included both the disk pack and the head assembly, leaving the actuator motor in the drive upon removal.