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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.