AHCI and correct drive geometry?

Jeremy Chadwick koitsu at freebsd.org
Wed Apr 16 12:29:44 UTC 2008

On Wed, Apr 16, 2008 at 09:46:15PM +0930, Daniel O'Connor wrote:
> On Wed, 16 Apr 2008, Josef Karthauser wrote:
> > So what's the word on AHCI and bios drive geometry? I'm having a real
> > pain of a time trying to get some 750gb sata drives running on my
> > FreeBSD7 box in AHCI mode. It doesn't seem to matter what disk
> > geometry I suggest to sysinstall, something complains of an invalid
> > disk upon booting it.
> >
> >
> >
> > Actually, in AHCI mode the bios screen doesn't report any information
> > on drive geometry, so all bets appear to be off in giving sysinstall
> > the correct figures.
> I would think anything this modern would totally ignore CHS and hence 
> any warnings about bogus geometry are in themselves totally bogus.
> ie just ignore sysinstalls bleatings.

Which begs the question -- why are we still spitting that warning out
during the fdisk portion of sysinstall?

Even to this day, I get mails from "junior" peers of mine asking what
it's about, whether it's important, and even a few refusing to
install/try the OS because of said message.

| Jeremy Chadwick                                    jdc at parodius.com |
| Parodius Networking                           http://www.parodius.com/ |
| UNIX Systems Administrator                      Mountain View, CA, USA |
| Making life hard for others since 1977.                  PGP: 4BD6C0CB |

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