Three extents described by the F1 DSCB plus fourteen extents described by each F3 DSCB up to a max of four F3 DSCBs.
Its 13 extents per F3 DSCB. But anyways he was asking about the volume count limit of 59 in a non-VSAM catalog record, not the extent count.
I believe that limit has something to do with the max size of a non-VSAM catalog record. After all the overhead info, the volume cell can hold up to 59 volumes.
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