> On Aug 22, 2022, at 11:17 AM, Warner Losh <i...@bsdimp.com> wrote:
>
>
>
> On Mon, Aug 22, 2022 at 7:13 AM Paul Koning via cctalk
> <cctalk@classiccmp.org> wrote:
>
>
> > On Aug 21, 2022, at 8:35 PM, W2HX via cctalk <cctalk@classiccmp.org> wrote:
> >
> > I always thought it was interesting how 5 1/4 is 3U (rack units). I thought
> > there might have been some relationship to that. But could have been just
> > coincidence.
>
> For floppies, likely yes. That fact did get used later on, in storage arrays
> where you can line up 14 or so disk drives, standing on edge, in a 3U 19 inch
> rack mounted system.
>
> I thought the initial 5.25" Hard Disks had ISSUES[tm] operating on edge. I
> remember the RD50 (5MB in all its glory) being touted as also operating on
> edge for the desk-side cases for DEC Rainbows and Professionals (and later
> MircoPDP-11s).
Could be. The examples I was thinking about are from 2001, using 1/2 height
SATA drives:
https://en.wikipedia.org/wiki/EqualLogic#/media/File:EqualLogic_PS100E_PeerStorage_Array_(157832701).jpg
paul
