My memory was wrong on normal termination. I rarely use DISP defaults. I would 
expect you are correct for the MOD instance

> -----Original Message-----
> From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU]
> On Behalf Of Paul Gilmartin
> Sent: Tuesday, July 10, 2018 3:07 PM
> To: IBM-MAIN@LISTSERV.UA.EDU
> Subject: Re: z/OS JCl vs. VSE JCL: VSAM files
> 
> On Tue, 10 Jul 2018 21:49:47 +0000, Gibney, Dave wrote:
> 
> >If DISP=SHR (that is if not DISP is provided), then the JCL Default of
> >(NEW,PASS) would happen and the job would fail
> >
> From the JCL Ref.
> Defaults
>     v If you omit the status subparameter, the default is NEW.
>     v If you omit the normal termination disposition subparameter, the default
> is
>       DELETE for a NEW data set or KEEP for an existing data set.
> 
> Hmmm.  Does this mean that fmr status MOD the data set will be deleted if
> allocation created it but kept if it existed beforehand?
> 
> -- gil
> 
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