Date: Tue, 17 Dec 2002 15:26:04 +0100 From: phk@FreeBSD.ORG To: Takahashi Yoshihiro <nyan@jp.FreeBSD.org> Cc: sos@FreeBSD.ORG, current@FreeBSD.ORG Subject: Re: ata driver Message-ID: <19990.1040135164@critter.freebsd.dk> In-Reply-To: Your message of "Tue, 17 Dec 2002 23:11:16 %2B0900." <20021217.231116.71144639.nyan@jp.FreeBSD.org>
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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 ?
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
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