19” form factor for the disks drive fir the space in the 19” relay rack.  
You’re right the platters themselves were smaller.  The disks were referred too 
by the mechanical FF.  19, 8, 5.25 etc.   

Sent from my PDP-7 Running UNIX V0 expect things to be almost but not quite. 

> On Jul 1, 2019, at 12:07 AM, Eric Smith <space...@gmail.com> wrote:
> 
>> On Sun, Jun 30, 2019, 19:37 Clem cole <cl...@ccc.com> wrote:
>> You can use RH70 (massbus controllers) and just use the larger (originally 
>> expensive) 19” disks from the early days. 
> 
> 
> 14 inch, but who's counting.  :-)
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