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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Walt H <waltabbyh@comcast.net>
Cc: arjanv@redhat.com,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	davzaffiro@tasking.nl
Subject: Re: [PATCH] pdcraid and weird IDE geometry
Date: 17 Jul 2003 15:58:38 +0100	[thread overview]
Message-ID: <1058453918.9055.12.camel@dhcp22.swansea.linux.org.uk> (raw)
In-Reply-To: <3F16B49E.8070901@comcast.net>

On Iau, 2003-07-17 at 15:37, Walt H wrote:

> On the second drive, it's like this:
> capacity = 80418240, head=255, sect = 63
> lba = capacity / (head * sect) = 5005 int or 5005.80 float
> lba = lba * (head * sect) = 80405325 int or 80418240.01 float
> lba = lba - sect = 80405262 int or 80418177 float

Would fixed point solve this. Start from capacity <<= 16 and then
do the maths. That would put lba in 65536ths of a sector which
should have the same result as your float maths


  reply	other threads:[~2003-07-17 14:46 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-17  2:26 Walt H
2003-07-17  8:49 ` Arjan van de Ven
2003-07-17 14:37   ` Walt H
2003-07-17 14:58     ` Alan Cox [this message]
2003-07-17 15:34       ` Jeff Garzik
2003-07-17 16:03         ` Andries Brouwer
2003-07-17 15:34       ` Andries Brouwer
2003-07-18  2:33         ` Walt H
2003-07-18  8:58           ` Andries Brouwer
2003-07-18 13:56             ` Walt H
2003-07-17 12:19 ` David Zaffiro
2003-07-18 14:51 Walt H

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