Freddie Cash <fjwc...@gmail.com> wrote:

> Unix partitioning has always been this way:
>   - create partition on disk for OS
>   - create sub-partitions for filesystems

No, not "always".  The very first Unix I ever encountered, AT&T 6th
Edition on a PDP-11/34 with RK05 disks, used what FreeBSD has (until
recently) called "dangerously dedicated" disks.  Ditto the first BSD-
derived Unix I used, SunOS 3.5 on a Sun-3/160 with the Xylogics SMD
disk controller.

Of course there was nothing dangerous about it then, because no one
had ever heard of installing more than one OS on any given disk pack
or cartridge.  (Even the large multi-platter disk packs were small
enough that one ordinarily needed multiple packs per OS; there was
no way anyone would have wanted to squeeze multiple OS onto a pack.)

Prior to the IBM PC-AT -- the first PC to have a hard drive -- how
many systems _did_ support multiple installs?
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