From owner-freebsd-current  Tue Dec 17  6:26: 8 2002
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To: Takahashi Yoshihiro <nyan@jp.FreeBSD.org>
Cc: sos@FreeBSD.ORG, current@FreeBSD.ORG
Subject: Re: ata driver 
From: phk@FreeBSD.ORG
In-Reply-To: Your message of "Tue, 17 Dec 2002 23:11:16 +0900."
             <20021217.231116.71144639.nyan@jp.FreeBSD.org> 
Date: Tue, 17 Dec 2002 15:26:04 +0100
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In message <20021217.231116.71144639.nyan@jp.FreeBSD.org>, Takahashi Yoshihiro 
writes:
>In article <19314.1040132436@critter.freebsd.dk>
>phk@FreeBSD.ORG writes:
>
>> Is it only for ATA/IDE disks ?
>> Does it depend on the size of the disks ?
>
>Only for the internal IDE controller.  The internal IDE controller on
>pc98 uses the fixed geometry which is 8 heads and 17 sectors.  If the
>size of the disk is larger than 4.2GB (65535C x 8H x 17S x 512B), a
>different geometry depend on the disk is used.

I guess the correct pseudocode then is:

	if (disk is ata &&
	    unit < 4 &&
	    size < 65535C x 8H x 17S x 512B) {
		use 8/17 geometry
	}

Is this correctly understood ?

So this would not affect an IDE controller in a PCI slot ?

-- 
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