IIUC, both types of datasets are VSAM linear datasets "under the covers"
That is a semi-urban myth <Gr>
True, both use fixed 4K blocks internally; this is similar to VSAM
Linear although linear can now use other blocksizes.
I beleive that the Media Manager is used on PDSE and HFS. Media Manager
is a low-level internal access method which has been around for a long
time and is used by a variety of components. In VSAM, it was originaly
used only for linear (e.g., DB2) but it is now used for almost all VSAM
access.
But Media Manager is separate from VSAM. No VSAM code is used to
access PDSE and HFS.
--
Bruce A. Black
Senior Software Developer for FDR
Innovation Data Processing 973-890-7300
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