Re: Custom floppy reading hardware interface

From: Anders Carlsson <>
Date: Mon, 20 Jan 2014 16:05:02 +0100
Message-ID: <8DB6D8ACFFF343FEBAB22FA1CF307F48@ryds>
Michau wrote:

> why can't you format a high density 5.25 floppy on a 1541?

Mainly due to different coercivity if I understand correctly. A DD or QD 
5.25" floppy disk has a coercivity of 300 Oe, while a HD has/needs (?) 600 

When it comes to 3.5" media, the difference between DD (600 Oe) and HD (750 
Oe) apparently is less, so it may still work to format a 1.44 MB floppy disk 
as double density, at least for a while.

Best regards

Anders Carlsson

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Received on 2014-01-20 16:00:03

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