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Guide to construction and use of 90 mm (3.5 in) flexible disk cartridges for data interchange, using modified frequency modulation recording at 7958 ftprad, 5.3 tpmm (135 tpi) on 80 tracks on each side. Dimensional, physical and magnetic characteristics
standard by BSI Group, 09/30/1988
BS 6958-1:1988
$172.72 $86.36