Date   : Sun, 08 Aug 2010 21:24:20 +0100
From   : mike@... (Mike Tomlinson)
Subject: Why did Acorn ADFS only allow 640KB on a floppy?

In article <AANLkTim42KuTGAPmk+ORQ4wYeFuL-0F2r9YcS-
MVgS5F@...>, Alex Taylor <zeem.uk@...> writes

>A standard Amiga floppy is formatted with 80 cylinders ? 2 heads ? 11
>sectors ? 512 bytes/sector, for 880K per disk.

It must have been one or more of the extended formatters, then, because
some disks definitely had 81 and 82 formatted and couldn't be read on
drives which wouldn't step past 80.

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