From mboxrd@z Thu Jan  1 00:00:00 1970
From: jam@magic.com (James A. Markevitch)
Date: Sat, 3 May 2008 18:59:44 -0700 (PDT)
Subject: [Unix-jun72] rk03 vs rk05
Message-ID: <200805040159.SAA04559@mist.magic.com>

> Confusingly, the 1e manual for /dev/rk0 says its an RK03. I'll have to go
> read the DEC manuals, but I would guess that the RK11 drive and interface is
> the same, but the RK03 and RK05 removable disk packs were of different
> storage capacity.

The controller is an RK11.
The disk drives are RK02, RK03, RK05.

The RK02 is a 1.2MB drive (256B per sector).
The RK03 is a 2.4MB drive (512B per sector).
The RK05 is a 2.4MB drive (512B per sector).

The media for the RK03 and RK05 are compatible (IBM 2315).  The drives
look different from each other, but I don't think the system can tell
the difference.

James Markevitch