14\" Disk Platter from the early mainframe era For Sale

14\
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14\" Disk Platter from the early mainframe era:
$15.00

Single platter from a disk pack of the 14xx, S/360 and S/370 era, suitable as a memento or to display.
The 14 inch diameter discs were stacked to form disk packs for use with drives like the IBM 2311, 2314 and many products that were built licensing this technology for use with other mainframes and minicomputers.
Iron oxide in a binder was coated on the aluminum disk to form a recording surface on each side. The platters were spun around their axis and magnetic heads would extend onto the surface radially to select one of the many concentric rings of recording that would fit on the disk, called tracks. The 2311 and 2314 divided the surface into 200 concentric tracks. Each track would hold 7,294 bytes of data spread around one rotation of the disk.
A stack of these platters provided for many surfaces each with tracks that could hold data. The set of tracks at a given head distance on the radius, across all the disk platter surfaces, was a cylinder. The 2311 pack had six platters in a stack, typically the top and bottom surface of the stack weren\'t used giving 10 active tracks read by the 10 heads on the access arm. The 2314 increased this to 11 platters, offering 20 tracks at a time across 20 heads. The capacity of a disk pack was 14.6MB for 2311 to 29MB for the 2314.
Similar platters were used singly in the disk drive in the IBM 1130 and in many minicomputers of the era, such as the DEC RK-05 drive.


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