As Paul said, disks with fixed-length sectors are represented as
fixed-length, data-only records.
The IBM 7094 and Honeywell 516 disks have variable length records, and
the track format includes metadata on record lengths and block
addresses. The IBM 1401 and 1620 disks include metadata for the block
addresses, which is not necessarily based on geometry.
/Bob Supnik
On 9/25/2018 12:00 PM, simh-requ...@trailing-edge.com wrote:
Message: 3
Date: Tue, 25 Sep 2018 09:53:04 -0400
From: Paul Koning<paulkon...@comcast.net>
To: Folkert van Heusden<m...@vanheusden.com>
Cc:simh@trailing-edge.com
Subject: Re: [Simh] disk file format (rk05)
Message-ID:<531aa05c-e3a0-4387-8806-b22269e5e...@comcast.net>
Content-Type: text/plain; charset=us-ascii
Disks are just sectors. I think that's true generally; if SIMH supported any
systems with variable length disk blocks something else would be needed, but
the only system I can think of that does so is the IBM 360. (Actually, that
one is much stranger, with its keyed sector feature.)
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