Why should directory blocks for PDSes be multiple of 45 ?
Thats not entirely accurate. A 3390 track holds 46 directory records,
but allocating only 45 allows the EOF for the directory to be placed on
the same track.
But for additional directory space, use multiples of 46, formula
45+(46*n). That will put 46 on each track, and only 45 on the LAST
track, again putting the EOF at the end of that track.
Why do this? No particular reason except that it is neater; the first
member can start with record 1 on the track following the directory.
PDS directory searches don't ever reach the EOF; the last block has a
key of all FFs, which stops the keyed search.
--
Bruce A. Black
Senior Software Developer for FDR
Innovation Data Processing 973-890-7300
personal: [EMAIL PROTECTED]
sales info: [EMAIL PROTECTED]
tech support: [EMAIL PROTECTED]
web: www.innovationdp.fdr.com
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