It could be using the LBI (Large Block Interface) to use a full track,
or after writing one block knows how much is left for the second block
on the track.

On Thu, Feb 2, 2017 at 1:59 AM, Buckton, T. (Theo) <[email protected]> wrote:
> Hi,
>
> Please assist. For a PS file with RECL of 260 the system determined block 
> size is 27820 (half-track). But that is for an  uncompressed file. A 
> compressed file will get a 32760 block size. Would this be due to the system 
> needing to cater for the compression details? Can somebody explain the logic 
> for me.
>
> Regards
> Theo
>
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