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HDDs are connected to systems by standard interface cables such as PATA (Parallel ATA), SATA (Serial ATA), USB or SAS (Serial Attached SCSI) cables., IBM announced HDDs in 1956 as a component of the IBM 305 RAMAC system and as new component to enhance the existing IBM 650 system, a general-purpose mainframe.The latter were primarily intended for the then-fledgling personal computer (PC) market.As the 1980s began, HDDs were a rare and very expensive additional feature in PCs, but by the late 1980s their cost had been reduced to the point where they were standard on all but the cheapest computers.The IBM PC/XT in 1983 included an internal 10 MB HDD, and soon thereafter internal HDDs proliferated on personal computers.External HDDs remained popular for much longer on the Apple Macintosh.Its primary distinguishing feature was that the disk heads were not withdrawn completely from the stack of disk platters when the drive was powered down.
The subsystem was not sold under the drive manufacturer's name but under the subsystem manufacturer's name such as Corvus Systems and Tallgrass Technologies, or under the PC system manufacturer's name such as the Apple Pro File.
This greatly reduced the cost of the head actuator mechanism, but precluded removing just the disks from the drive as was done with the disk packs of the day.
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.
HDDs became the dominant secondary storage device for general-purpose computers by the early 1960s.
Continuously improved, HDDs have maintained this position into the modern era of servers and personal computers.IBM 2305 in 1970) so that no time was lost physically moving the heads to a track.