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A few years later, designers were exploring the possibility that physically smaller platters might offer advantages.
Drives with non-removable eight-inch platters appeared, and then drives that used a in (130 mm) form factor (a mounting width equivalent to that used by contemporary floppy disk drives).
Most HDDs in the early 1980s were sold to PC end users as an external, add-on subsystem.
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.
SSDs have higher data-transfer rates, higher areal storage density, better reliability, The primary characteristics of an HDD are its capacity and performance.
Later "Winchester" drives abandoned the removable media concept and returned to non-removable platters.
Like the first removable pack drive, the first "Winchester" drives used platters 14 inches (360 mm) in diameter.
Non-removable HDDs were called "fixed disk" drives.
Some high-performance HDDs were manufactured with one head per track (e.g.
The IBM PC/XT in 1983 included an internal 10 MB HDD, and soon thereafter internal HDDs proliferated on personal computers.