large disks

["dkwok@iware.com.au" <dkwok@iware.com.au>]

I have to add a large disk, 80G to the obsd3.4 machine. The BIOS could 
not recognise it. The way to get around this was to install BSD on a 
small disk and mount this on /opt mount point.

The question is that when doing fdisk to the 80G disk it did not show 
the correct geometry. I have looked the Seagate web site about the spec 
of the hard drive. It said it is cyl 16383 head 16 sectors 63. The 
minimum sectors are 156,031,488. Anyhow the sector no. does not agree 
with what you get from multipling the cyl, head and sector together.

For fdisk I just used the default settings and when it comes to the 
disklabel I set the total sectors to the correct sectors. Although the 
cylinders, tracks/cylinder and sectors/track details are incorrect, the 
disk seems to be working properly with newfs command and df shows the 
correct disk size.

I know this may not be the correct way of doing this. Large disk is 
becoming normal these days. I can't buy disks that are smaller than 30G. 
So what is the correct way of setting up large disks. I have checked the 
FAQ however it does not mention these issues.

Regards
David Kwok