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Before I start my question, let me provide an example

How much total space be allowed for  SPACE=(TRK,(10,5))

I read somewhere during my training that the total units can be calculated by using the following formula

Total units(Trks/blks/cyl)= Primary + 15 * Secondary.

Thus as per this formula

SPACE=(TRK,(10,5)) should occupy 85 Tracks

My question here is that whether the formula that I used is correct or not?
and if it is correct, why do we use a factor 15 to multiply to the secondary
unit.

Thanks!!
Krishna

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