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The answer to your question of why you would use the factor of 15 is because your space is taken in either blocks, cylinders, or in your case tracks. Their are 15 tracks = 1 cylinder. When allocating space the first allocation number is the primary allocation that must be contiguous and then the system allows 15 more extents to get your secondary allocation which does not need to be contiguous. In your example space=(trk,(10,5)) the primary allocation would be 10 tracks, the secondary allocation is 15 extents more of 5 tracks = 75 tracks total plus the 10 primary = 85 tracks total for that DSN. Hope this helps



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