------------------------------<snip>-------------------
All I can tell you is that I tested this on an old 3380 circa 1994 with
MVS 4.2(? so long ago not sure anymore). Nothing other than the
directory was stored on the first track. I then tested on a RAMAC2, but
no problem creating a 1-track PDS and storing a member. If I'm wrong,
I'm wrong, but that's what I remember.
----------------------------<unsnip>-------------------
Tom, you may very well have gotten the results you cite. But consider:
how large was the block you were writing, as compared to the space
available on the track? On a 3380, the block might not fit, whereas in a
3390, it might. Geometrically speaking, of course. <G>
Remember that very few records in a load module are larger than 256
bytes; IIRC only the actual LMOD TXT records could be larger than 256.
And the linkage editor is reasonably good at packing data into a track,
even at the risk of segmenting txt records. (But in my experience,
always on CSECT boundaries.) Since 32760 will fit on either a 3380 or
3390 track, the fewer txt records to read can only make Program Fetch
more efficient.
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