I found this by doing search,

 ICKDSF manual Appendix C. VTOC/Index are 983 / 50, 2944 / 150, 9828 / 491, and 
19656 / 980 for mod 3, 9, 27, 54 respectively. 



"Confidentially doc, I am the wabbit."

Bugs Bunny

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On Thursday, May 22nd, 2025 at 3:25 PM, Mike Schwab 
<000005962a42dc49-dmarc-requ...@listserv.ua.edu> wrote:

> It allocates the expanded area in 21 cylinder chunks. So you need to
> expand a Mod 54 VTOC / Index by 4/315ths.
> 
> On Thu, May 22, 2025 at 12:48 PM Steve Beaver <
> 0000050e0c375a14-dmarc-requ...@listserv.ua.edu> wrote:
> 
> > They are just huge meaning 5 Mod54's
> > 
> > -----Original Message-----
> > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On
> > Behalf Of Pommier, Rex
> > Sent: Thursday, May 22, 2025 7:59 AM
> > To: IBM-MAIN@LISTSERV.UA.EDU
> > Subject: Re: [EXTERNAL] Re: 3390A’s
> > 
> > Not a dumb question. In the context of PAVs and all that fun stuff,
> > 3390Bs are the "real" volumes and the 3390As are the PAV volumes.
> > 
> > Rex
> > 
> > -----Original Message-----
> > From: IBM Mainframe Discussion List IBM-MAIN@LISTSERV.UA.EDU On Behalf
> > Of Jay Maynard
> > Sent: Thursday, May 22, 2025 6:43 AM
> > To: IBM-MAIN@LISTSERV.UA.EDU
> > Subject: [EXTERNAL] Re: 3390A’s
> > 
> > All right, dumb question time. What's a 3390A/3390B? From context, it's
> > not the size of the volume, is it?
> > 
> > On Thu, May 22, 2025 at 2:45 AM Radoslaw Skorupka <
> > 00000471ebeac275-dmarc-requ...@listserv.ua.edu> wrote:
> > 
> > > W dniu 22.05.2025 o 01:42, Steve Beaver pisze:
> > > 
> > > > Is anyone using 3390A’s?
> > > 
> > > IMHO everyone, maybe except zPDT users.
> > > All current disks system do support PAV And there are many features
> > > (not necessarily paid) related to PAV - WLMpav, HyperPAV, SuperPAV.
> > > And some others like MIDAW or HPF.
> > > IMHO usually you get a package containing all the features.
> > > 
> > > What's your problem with 3390A?
> > > 
> > > --
> > > Radoslaw Skorupka
> > > Lodz, Poland
> > > 
> > > ----------------------------------------------------------------------
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> > 
> > --
> > Jay Maynard
> > 
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> 
> 
> --
> Mike A Schwab, Springfield IL USA
> Where do Forest Rangers go to get away from it all?
> 
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