Winchester disk

Named after the .30-caliber Winchester rifle, the 3340 Winchester disk drive is a hard drive developed by IBM that had two 30MB capacity and offered a 30 millisecond (ms) access time. What made this drive significant is the technique where the read/write heads would rise or lift off from the disk while the disk increased and lowered when the disk decelerated. This enabled the heads to not have to move off the disk each time the speed was increased or decreased. Future hard drives after the 3340 began to use this as a standard for hard drive development.

Also see: Hard drive definitions