Tom,

Thanks. I found this summary only.
https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.1.0/com.ibm.zos.v2r1.idad400/coefsds.htm

I am trying to understand what is going on under the covers. I am also trying 
to understand what programming changes might be needed if a customer is using 
EXCP rather than a standard access method. 
I would also like to know what is the difference between the type 1 and type 2 
extended data sets.

Lennie Dymoke-Bradshaw | Security Lead | RSM Partners Ltd  
Web:              www.rsmpartners.com
‘Dance like no one is watching. Encrypt like everyone is.’

-----Original Message-----
From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Tom 
Marchant
Sent: 03 April 2019 15:40
To: [email protected]
Subject: Re: [IBM-MAIN] Extended format datasets

On Wed, 3 Apr 2019 07:49:31 -0500, Lennie Dymoke-Bradshaw wrote:

>Can anyone point me to documentation showing the internal differences between 
>basic format and extended format datasets?

Did you look in DFSMS: Using Data Sets?

--
Tom Marchant

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