Devices with blocksizes under 32K have a feature called track overflow.
When it reaches the end of track the block is continued on the next track,
and the remainder after the last partial block is unused.

Linkage editors will determine the remaining space on a track and write the
highest multiple of 1K that will fit. Compress in place object modules
reblock to 1KB multiples.

I assume VB/FB members are reblocked by compress in place, but not sure.

On Tue, Aug 26, 2025 at 7:22 AM Paul Edwards <
[email protected]> wrote:

> On Tue, 26 Aug 2025 12:16:06 +0000, Seymour J Metz <[email protected]> wrote:
>
> >My recollection is that COPYMOD is only valid for DASD-DASD.
>
> I only need DASD to DASD. I only need to transport a single
> load module.
>
> And I (basically) have control over the linker (pdld) that will
> directly produce IEBCOPY (basically) format (artificially
> produce an unloaded load module).
>
> Load modules only exist in DASD, so that's not a problem.
>
> It will look like it has been unloaded from a DASD - but the
> type of DASD is up for grabs.
>
> Note that this already exists, but we're trying to clarify what
> the device characteristics should ideally be for general
> purpose use. I was thinking 1 record per track, 1 head and
> up to 65536 cylinders giving a maximum load module size
> of 384 MiB (with 6144-byte blocks), which is plenty.
>
> But the IEBCOPY manual has a different artificial device.
> But they have a different objective than transporting a
> single load module.
>
> BFN. Paul.
>
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-- 
Mike A Schwab, Springfield IL USA
Where do Forest Rangers go to get away from it all?

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