On Aug 22, 2022, at 11:17 AM, Warner Losh
<imp(a)bsdimp.com> wrote:
On Mon, Aug 22, 2022 at 7:13 AM Paul Koning via cctalk <cctalk(a)classiccmp.org>
wrote:
On Aug 21, 2022, at 8:35 PM, W2HX via cctalk
<cctalk(a)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: