From owner-freebsd-hardware Thu Aug 6 09:38:01 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id JAA03258 for freebsd-hardware-outgoing; Thu, 6 Aug 1998 09:38:01 -0700 (PDT) (envelope-from owner-freebsd-hardware@FreeBSD.ORG) Received: from antipodes.cdrom.com (castles218.castles.com [208.214.165.218]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id JAA03218 for ; Thu, 6 Aug 1998 09:37:41 -0700 (PDT) (envelope-from mike@antipodes.cdrom.com) Received: from antipodes.cdrom.com (localhost [127.0.0.1]) by antipodes.cdrom.com (8.8.8/8.8.5) with ESMTP id JAA03442; Thu, 6 Aug 1998 09:36:00 -0700 (PDT) Message-Id: <199808061636.JAA03442@antipodes.cdrom.com> X-Mailer: exmh version 2.0zeta 7/24/97 To: Bruce Evans cc: ks@itp.ac.ru, mike@smith.net.au, hardware@FreeBSD.ORG Subject: Re: IBM 16 GB IDE HDD In-reply-to: Your message of "Thu, 06 Aug 1998 20:55:56 +1000." <199808061055.UAA12694@godzilla.zeta.org.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Thu, 06 Aug 1998 09:35:59 -0700 From: Mike Smith Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > > 0x1000 Use LBA addressing instead of the default CHS addressing. > > This is seriously incomplete and out of date. LBA addressing should almost > never be used, since no cases are known where it is necessary, and cases > are known where it causes trashed disks (dumping to any drive where the > default geometry is not the same as the fake LBA geometry). Which "default" geometry? In a correctly configured system, geometry is a nonissue. > >Hmm. I think that you will still hit problems at the 8GB mark, but you > >may have removed the only safety barrier. > > Maybe there wasn't really a barrier. ATA disks larger than about 8GB > are supposed to have an artifical barrier at about 8GB. If you ignore > this barrier and can somehow tell the driver the true size then they > will just work under FreeBSD provided they support CHS addressing. I think the barrier was the lack of suitably-sized fake geometry. We should soon support fully-LBA addressing, making geometry considerations almost totally irrelevant. -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message