Date   : Wed, 15 Apr 2009 01:29:39 +0100
From   : jgh@... (Jonathan Graham Harston)
Subject: Writing BBC Disc Images on Linux

Jules Richardson wrote:
> Interesting - IIRC CP/M (at least the OS) often uses a 128 byte sector size
 
CP/M uses 128-byte records (logical sectors) which are mapped by
the BIOS (Basic IO System - low level disk and other IO drivers) to
the physical disk sectors, a process in CP/M called blocking and
deblocking. So, 4 128-byte records are mapped into one 512-byte
sectors. The same thing happens with Acorn CP/M when 2 128-byte
records are mapped into each 256-byte physical disk sector.
 
-- 
J.G.Harston - jgh@...                - mdfs.net/User/JGH
HADFS System Resources - http://mdfs.net/Software/HADFS