Status of support for 4KB disk sectors
freebsd at jdc.parodius.com
Wed Jul 20 03:14:34 UTC 2011
On Wed, Jul 20, 2011 at 02:39:28AM -0700, perryh at pluto.rain.com wrote:
> Chuck Swiger <cswiger at 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 at 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 |
More information about the freebsd-stable