linux-kernel - Re: floppy question of the hour

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Message-ID: <20080528134257.GA16164@csclub.uwaterloo.ca>
Date:	Wed, 28 May 2008 09:42:57 -0400
From:	lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
To:	Phillip Susi <psusi@....rr.com>
Cc:	Gene Heskett <gene.heskett@...il.com>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>
Subject: Re: floppy question of the hour

On Tue, May 27, 2008 at 05:49:18PM -0400, Phillip Susi wrote:
> Yes, the interleave slows you down, since after accessing sector 1, the 
> head must wait to pass over 3 other sectors before finally reaching 
> sector 2, therefore, you can only read 1/4 of the sectors on the track 
> each revolution of the disk.  That leaves 4 revolutions at 300 rpm 
> giving 0.8s to read a track, or 64 seconds to read all 80 tracks, plus 
> seek time.  That still does not explain 3 minutes though... not sure 
> what else could be slowing you down.

Just do what the Amiga did:  Read the entire track into a buffer in
memory, then deal with the sectors, and write the entire track back. :)

-- 
Len Sorensen
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