When you allocatie a dataset you specify space (blocks, tracks cylinders, MB or 
whatever) and a primary and secondary amount. The space and secondary amount is 
preserved in The DSCB1/8. The space was also used to allocate the primary 
extent(s). It is just the primary amount (as specified in the allocation 
command) that does not seem to be available anymore.

Fred!

Sent from my new iPad

> On May 6, 2015, at 22:19, Tony Harminc <[email protected]> wrote:
> 
>> On 6 May 2015 at 15:07, John Eells <[email protected]> wrote:
>> I never actually checked, but I "assume" that ISPF and other things that
>> show used space in allocation request units other than tracks or cylinders
>> use the DS1DSPAC fields and track length to calculate space in those
>> original request units.
> 
> But how does it know what those original units were?
> 
> Tony H.
> 
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