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z/OS DFSMS Using Data Sets
If the data set contains location-dependent information in the form of an actual track address (such as MBBCCHHR or CCHHR), you can request space in the number of tracks and the beginning address. In this example, 500 tracks is required, beginning at relative track 15, which is cylinder 1, track 0:
Restriction: Data sets that request space by absolute track are not eligible to be system managed and they interfere with DASD space management done by the space management products and the storage administrator. Avoid using absolute track allocation.
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