On Fri, 23 Feb 2018 14:49:05 +0000, Christopher Y. Blaicher 
<cblaic...@syncsort.com> wrote:
>
>The access methods detect the key=0, count=0 records and process them as EOF, 
>which is how they signify the end of a PDS member.  Every member has an EOF 
>record with the rare exception of a member that ends at the end of the track 
>on the last track of a data set.  ...
>
VIO has its own surprising rules.  I once (circa XA) caused paging space
exhaustion by reading an uninitialized data set allocated as
    UNIT=VIO,SPACE=(0,large)

-- gil

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