problems with disk geometry

Gayn Winters gayn.winters at
Thu Oct 6 09:42:46 PDT 2005

> -----Original Message-----
> From: owner-freebsd-hackers at 
> [mailto:owner-freebsd-hackers at] On Behalf Of Kamal 
> R. Prasad
> Sent: Thursday, October 06, 2005 8:56 AM
> To: freebsd-hackers at
> Subject: problems with disk geometry
> hello,
>   Im trying to install FreeBSD 6.0 beta5 on a samsung SP1604N hard  
> disk of about 160 GB.
> The installer complains that it has a problem with the disk 
> geometry.  
> The exact message is given below:-
> ------------------------------------------
> A geometry of 310101/16/63 is incorrect for ad1. Using a more likely  
> geometry. If this geometry is incorrect.. pl. consult the 
> hardware guide
> -------------------------------------------
> fdisk goes through the process of creating the reqd slices 
> and when I  
> try to commit the new partition table -it says it cannot write to / 
> dev/ad1.
> Can someone tell me how to get past this problem?
> thanks
> -kamal

I doubt it is your disk geometry.  You will probably need to provide a
little more information.  I assume you've got another OS on /dev/ad0 and
that you are letting sysinstall put 6.0 onto /dev/ad1 as a (dangerously)
dedicated drive?  What does the BIOS report?  How old are the machine
and its BIOS?  What does fdisk say when run either standalone or from
the first OS?


More information about the freebsd-hackers mailing list