Date: Tue, 19 Jul 2011 20:14:31 -0700 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: perryh@pluto.rain.com Cc: freebsd-stable@freebsd.org, peterjeremy@acm.org Subject: Re: Status of support for 4KB disk sectors Message-ID: <20110720031431.GA33758@icarus.home.lan> In-Reply-To: <4e26a250.iKKzhkOLoTB3sdOr%perryh@pluto.rain.com> References: <CAN6yY1uaUqk2ifiNViJyMFJWf60a4DmCiVs3Z=--_TjtzseABQ@mail.gmail.com> <20110718234124.GA5626@icarus.home.lan> <CAN6yY1uaEwoEhEuoTNPqzywRaCPEvcLY-ddyFRUV00FcBDU1BA@mail.gmail.com> <E8F5CB22-21D5-4AF9-A690-1DB99D31F4CC@mac.com> <20110719211039.GA16085@server.vk2pj.dyndns.org> <02D367A5-CA74-4E8A-BE3E-F81485B287A7@mac.com> <4e26a250.iKKzhkOLoTB3sdOr%perryh@pluto.rain.com>
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On Wed, Jul 20, 2011 at 02:39:28AM -0700, perryh@pluto.rain.com wrote: > Chuck Swiger <cswiger@mac.com> wrote: > > On Jul 19, 2011, at 2:10 PM, Peter Jeremy wrote: > > > On 2011-Jul-19 10:54:38 -0700, Chuck Swiger <cswiger@mac.com> 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 |
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