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Guide to construction and use of 130 mm (5.25 in) flexible disk cartridges for data interchange using modified frequency modulation recording at 7958 ftprad, 3.8 tpmm (96 tpi) on both sides. Dimensional, physical and magnetic characteristics
standard by BSI Group, 02/28/1989
BS 7023-1:1988
$231.14 $115.57