[Simh] Which PDP-11 to choose

[Eric Smith]

On Mon, Jul 1, 2019 at 5:31 AM Clem cole <clemc at ccc.com> wrote:

> 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.
>

The DEC RP and RM drives were not rack-mount, and the drives were much
wider than 19-inch.
The entire industry referred to disk size in terms of the platter diameter,
which went from 14 to 8 to 5.25 to 3.5 to 2.5 inches. The drives were
always wider than the stated platter diameter.
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