Note that the original reference card was published in 1989; over the last 28 years there have been a few changes. Don't worry about the geometry, and use the table WITHOUT keys. Half-track blocking is 27998 bytes, so divide 27998 by 80 (your record length) and discard the fraction. That tells you how many records will fit into half a track. Double it for tracks and multiply by 15 to get cylinders. Divide the result into your number of records and round up (that is, a division result of 6.001 would become 7). That is the number of cylinders needed.Downloaded that file and it talks about geometry. Should we be knowing the geometry of the DASD too while calculating the cylinders??
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