The character X is used to depict the space used to hold control information for the control interval. This contains such information as the length of the data in the control interval and the length of any freespace. For fixed-length files the length of this area is always 10. For variable- length files it is 4 bytes, plus 3 bytes for each data record in the control interval (actually, VSAM does save some space when more than two consecutive records have the same length of data).
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