Colleagues, this has been one of the most enjoyable threads I have ever read
in my 5 years of lurking.  It sounds like it's not done yet so after saying
my minimal piece I'll shut up and continue to lurk in enjoyment.  For the
record, here's the attributes I've found so appealing:

1. 99.9 % facts.
2. 0.00 % emotion.
3. Posters to date are as far over my head as the planet they just found
beyond Pluto.
4. Posters of lofty knowledge are learning from other posters.
5. No references to how the 360/165 did it under MVT.
6. Brevity.


P.S. to Darren, frame the thread, use it as the model to which compare all
others in the future.    

Going back to my lurking den......
tb



-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf
Of Charles Mills
Sent: Friday, July 29, 2005 5:02 PM
To: [email protected]
Subject: Re: CKD commands and PDS writing

We agree that re-writing an EOF record would be an exercise in futility and
I'm sure no one is interested in hearing us debate, but could you in fact
re-write an EOF record with Write Data? Is not the data length zero, and is
not a zero-length CCW illegal?

Charles



-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf
Of Bill Fairchild
Sent: Friday, July 29, 2005 10:10 AM
To: [email protected]
Subject: Re: CKD commands and PDS writing

Not true if the EOF record is already there.  You can rewrite the EOF record
into the same space on the track without using a formatting write, although
this does not usually accomplish anything useful.  The command in  this case
would be Write Data or Write Key and Data, which are non-formatting writes,
as opposed to Write Count Key and Data, which is a formatting write, and is 

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