I believe it was discussed on IBM-MAIN after IBM made the announcement
(65520 cyls).  The model 27 and 54 numbers were derived by members of this
listserv based on previous 3390 model device capacities.

Regards,
John Kalinich
Computer Sciences Corp



                                                                                
                          
                      Steve Comstock                                            
                          
                      <steve                   To:      [email protected]    
                          
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                      COM>                     Subject: Re: capacity of largest 
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John P Kalinich wrote:
>                         CKD DEVICES
>
>                DATA  ALT  TRACKS/  BYTES/   BYTES/       BYTES/
> DISK TYPE      CYLS  CYLS   CYL    TRACK     CYL         MODULE
> 3390-54       65520    0     15    56,664   849,960 55,689,379,200
>

Thanks, John. That's what I was hoping to see.

Can you tell me where you found that?

Kind regards,

-Steve Comstock

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