From owner-freebsd-current Mon Oct 12 11:30:41 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id LAA09386 for freebsd-current-outgoing; Mon, 12 Oct 1998 11:30:41 -0700 (PDT) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from tim.xenologics.com (tim.xenologics.com [194.77.5.24]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id LAA09379 for ; Mon, 12 Oct 1998 11:30:38 -0700 (PDT) (envelope-from seggers@semyam.dinoco.de) Received: (from uucp@localhost) by tim.xenologics.com (8.8.5/8.8.8) with UUCP id UAA13332; Mon, 12 Oct 1998 20:28:28 +0200 (MET DST) Received: from semyam.dinoco.de (semyam.dinoco.de [127.0.0.1]) by semyam.dinoco.de (8.9.1/8.8.8) with ESMTP id UAA04383; Mon, 12 Oct 1998 20:25:19 +0200 (CEST) (envelope-from seggers@semyam.dinoco.de) Message-Id: <199810121825.UAA04383@semyam.dinoco.de> To: Alfred Perlstein Cc: Zach Heilig , current@FreeBSD.ORG, seggers@semyam.dinoco.de Subject: wd, crash dumps and strange geometries (was: Re: bitten 3 times already. ) In-reply-to: Your message of "Mon, 12 Oct 1998 19:10:00 +0200." <199810121710.TAA28992@semyam.dinoco.de> Date: Mon, 12 Oct 1998 20:25:16 +0200 From: Stefan Eggers Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > What I see here is what I'd expect for about 16.000 sectors/cylinder. > That's not a reasonable number and I guess the driver thinks it has 16 > heads and 1023 sectors/cylinder due to using LBA. I took a closer look, thought about this and noticed that the para- meters you get are from the enforcement of 15 heads with the flags you set. This in itself doesn't matter for normal accesses as you use LBA and that doesn't need a geometry. Now comes the fun part. If the drive thinks it has 16 heads (that is the shipping default for the DHEA-38451 according to the web site) and you use the geometry for 15 heads the CHS addressing will be wrong and maybe this is what somehow caused the failure you saw. Stefan. -- Stefan Eggers Lu4 yao2 zhi1 ma3 li4, Max-Slevogt-Str. 1 ri4 jiu3 jian4 ren2 xin1. 51109 Koeln Federal Republic of Germany To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message