Status of support for 4KB disk sectors

Chuck Swiger cswiger at
Wed Jul 20 03:49:12 UTC 2011

On Jul 19, 2011, at 8:14 PM, Jeremy Chadwick wrote:
> On Wed, Jul 20, 2011 at 02:39:28AM -0700, perryh at wrote:
>> 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.

Come to think of it, I do remember that switch, yes.

Do you happen to know whether this limitation was part of the Sun hardware,
or of SunOS?  CMU had a lot of Sun3 machines and NeXT clusters, so I ended
up mixing NeXT CD-ROM and the Canon? magneto-optical drives with Sun H/W,
and vice versa.

SunOS wasn't the only O/S which was run on a m68k Sun box.  ;-)

> 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.

I'm pretty sure some folks had NEC caddy drives as well.


More information about the freebsd-stable mailing list