From owner-freebsd-stable@FreeBSD.ORG Wed Jul 20 03:14:34 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 BF899106564A for ; Wed, 20 Jul 2011 03:14:34 +0000 (UTC) (envelope-from jdc@koitsu.dyndns.org) Received: from qmta12.emeryville.ca.mail.comcast.net (qmta12.emeryville.ca.mail.comcast.net [76.96.27.227]) by mx1.freebsd.org (Postfix) with ESMTP id A291B8FC08 for ; Wed, 20 Jul 2011 03:14:34 +0000 (UTC) Received: from omta16.emeryville.ca.mail.comcast.net ([76.96.30.72]) by qmta12.emeryville.ca.mail.comcast.net with comcast id A3EU1h0041ZMdJ4AC3EXou; Wed, 20 Jul 2011 03:14:31 +0000 Received: from koitsu.dyndns.org ([67.180.84.87]) by omta16.emeryville.ca.mail.comcast.net with comcast id A3DR1h02B1t3BNj8c3DSBG; Wed, 20 Jul 2011 03:13:26 +0000 Received: by icarus.home.lan (Postfix, from userid 1000) id 03036102C36; Tue, 19 Jul 2011 20:14:32 -0700 (PDT) Date: Tue, 19 Jul 2011 20:14:31 -0700 From: Jeremy Chadwick To: perryh@pluto.rain.com Message-ID: <20110720031431.GA33758@icarus.home.lan> References: <20110718234124.GA5626@icarus.home.lan> <20110719211039.GA16085@server.vk2pj.dyndns.org> <02D367A5-CA74-4E8A-BE3E-F81485B287A7@mac.com> <4e26a250.iKKzhkOLoTB3sdOr%perryh@pluto.rain.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4e26a250.iKKzhkOLoTB3sdOr%perryh@pluto.rain.com> User-Agent: Mutt/1.5.21 (2010-09-15) 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 03:14:34 -0000 On Wed, Jul 20, 2011 at 02:39:28AM -0700, perryh@pluto.rain.com wrote: > 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. I don't think Plextor was around back then; they used to be called TEXEL back in the early 90s. The only Sun SCSI CD drives I saw were external and caddy-based, so I mentally correlate them with NEC. Back then I wasn't looking at brands as much as I do today, though. -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, US | | Making life hard for others since 1977. PGP 4BD6C0CB |