From owner-freebsd-stable@FreeBSD.ORG Wed Jul 20 02:49:06 2011 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 03D5A106566C for ; Wed, 20 Jul 2011 02:49:06 +0000 (UTC) (envelope-from perryh@pluto.rain.com) Received: from agora.rdrop.com (agora.rdrop.com [IPv6:2607:f678:1010::34]) by mx1.freebsd.org (Postfix) with ESMTP id 9FB288FC08 for ; Wed, 20 Jul 2011 02:49:05 +0000 (UTC) Received: from agora.rdrop.com (66@localhost [127.0.0.1]) by agora.rdrop.com (8.13.1/8.12.7) with ESMTP id p6K2n17r048249 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Tue, 19 Jul 2011 19:49:02 -0700 (PDT) (envelope-from perryh@pluto.rain.com) Received: (from uucp@localhost) by agora.rdrop.com (8.13.1/8.12.9/Submit) with UUCP id p6K2mxW1048248; Tue, 19 Jul 2011 19:48:59 -0700 (PDT) Received: from fbsd81 ([192.168.200.81]) by pluto.rain.com (4.1/SMI-4.1-pluto-M2060407) id AA17752; Tue, 19 Jul 11 19:39:05 PDT Date: Wed, 20 Jul 2011 02:39:28 -0700 From: perryh@pluto.rain.com To: cswiger@mac.com Message-Id: <4e26a250.iKKzhkOLoTB3sdOr%perryh@pluto.rain.com> References: <20110718234124.GA5626@icarus.home.lan> <20110719211039.GA16085@server.vk2pj.dyndns.org> <02D367A5-CA74-4E8A-BE3E-F81485B287A7@mac.com> In-Reply-To: <02D367A5-CA74-4E8A-BE3E-F81485B287A7@mac.com> User-Agent: nail 11.25 7/29/05 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: freebsd-stable@freebsd.org, peterjeremy@acm.org Subject: Re: Status of support for 4KB disk sectors X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Jul 2011 02:49:06 -0000 Chuck Swiger wrote: > On Jul 19, 2011, at 2:10 PM, Peter Jeremy wrote: > > On 2011-Jul-19 10:54:38 -0700, Chuck Swiger wrote: > >> Unix operating systems like SunOS 3 and NEXTSTEP would happily > >> run with a DEV_BSIZE of 1024 or larger-- they'd boot fine off > >> of optical media using 2048-byte sectors, > > > > Actually, Sun used customised CD-ROM drives that faked 512-byte > > sectors to work around their lack of support for anything else. > > Hmm-- my brain could be fuzzy about things twenty-plus years > ago. But I remember booting a Sun3_35 or _60 from a non-Sun > or Sun OEM'ed SCSI CD-ROM drive, probably a Plextor? IIRC, Plextor (and maybe some others) had a switch to select 512 or 2048 as the default transfer size, precisely so that they could be used as boot devices with systems that supported only 512.