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The flying height or floating height or head gap is the distance between the disk read/write head on a hard disk drive and the platter.The first commercial hard-disk drive, the IBM 305 RAMAC (1956), used forced air to maintain a 0.002 inch (51 μm) between the head and disk.
A hard disk head on an access arm resting on a hard disk platter. The access time or response time of a rotating drive is a measure of the time it takes before the drive can actually transfer data. The factors that control this time on a rotating drive are mostly related to the mechanical nature of the rotating disks and moving heads. It is ...
IBM's first hard drive, the IBM 350, used a stack of fifty 24-inch platters and was of a size comparable to two large refrigerators. In 1962, IBM introduced its model 1311 disk, which used six 14-inch (nominal size) platters in a removable pack and was roughly the size of a washing machine. This became a standard platter size and drive form ...
This means the heads cover more distance per unit of time on the outer tracks than on the inner tracks. This method is typical with computer hard drives. Constant linear velocity (CLV) keeps the distance covered by the heads per unit time fixed. Thus the disk has to slow down as the arm moves to the outer tracks. This method is typical for CD ...
The difference between those widths and the name of the bay size is because it is named after the size of floppy that would fit in those drives, a 5.25-inch-wide square. Half-height drive bays are 1 + 5 ⁄ 8 inches (41.3 mm) high by 5 + 3 ⁄ 4 inches (146.1 mm) wide, and are the standard housing for CD and DVD drives in modern computers.
Physical layout of sectors in a zone-bit disc: As distance from the centre increases, the number of sectors in a given angle increases from one (red) to two (green) to four (grey). The inner tracks are packed as densely as the particular drive's technology allows. The packing of the rest of the disks is changed depending on the type of disk.
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The recording speed on such drives was rated in multiples of 150 KiB/s; a 4X drive, for instance, would write steadily at around 600 KiB/s. The transfer rate was kept constant by having the spindle motor in the drive vary in speed and run 2.4 times [ 1 ] as fast when recording at the inner rim of the disc as on the outer rim.