As I commented recently in another thread, in the ICKDSF manual there is a table of MAXVTOC/MAXVTOCIX sizes in : "Calculating the size of the VTOC index" in appendix C of ICKDSF Users Guide GC35-0033-39.
Unfortunately, there is no reference to the size of the VVDS required to support a MAXVTOC/MAXVTOCIX formatted volume. Would be nice to have! HTH, <snip> The theoretical worst case for a TSO pack is that every track on the volume could be a single-track data set, except for the following: volume label track, VTOC, VTOC index, and VVDS. And each such single-track data set would need at least one DSCB (Format 1) record in the VTOC, and you can only get about 50 of them on each VTOC track. Bill Fairchild </snip> ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN