From owner-freebsd-current Mon Oct 12 09:32:12 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id JAA19802 for freebsd-current-outgoing; Mon, 12 Oct 1998 09:32:12 -0700 (PDT) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from godzilla.zeta.org.au (godzilla.zeta.org.au [203.15.68.22]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id JAA19786 for ; Mon, 12 Oct 1998 09:32:08 -0700 (PDT) (envelope-from bde@godzilla.zeta.org.au) Received: (from bde@localhost) by godzilla.zeta.org.au (8.8.7/8.8.7) id CAA13430; Tue, 13 Oct 1998 02:31:49 +1000 Date: Tue, 13 Oct 1998 02:31:49 +1000 From: Bruce Evans Message-Id: <199810121631.CAA13430@godzilla.zeta.org.au> To: bde@zeta.org.au, bright@hotjobs.com, zach@gaffaneys.com Subject: Re: bitten 3 times already. Cc: current@FreeBSD.ORG Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG >>wdc0 at 0x1f0-0x1f7 irq 14 flags 0x7fff7fff on isa ^ ^ >>wdc0: unit 0 (wd0): , LBA, DMA, multi-block-16, sleep-hack >>wd0: 8063MB (16514064 sectors), 17475 cyls, 15 heads, 63 S/T, 512 B/S >... I wrote: >I don't know how the geometry can be H=15/S=63. This looks like the >actual geometry, but the probe should report the nominal one which should >be H=255/S=63 for this size of drive. It's suprising that this size of >drive is made. It's only 31MB over the 1024*255*63 limit, and exceeding >this limit causes problems. The geometry is forced to a possibly wrong value, er shape, using the WDOPT_FORCEHD bits (0x0f000f00). Normally this is a no-op, since the driver tells the drive which geometry to use, but the driver doesn't bother to tell the drive this if LBA mode is configured, so a mismatch is possible. Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message