Re: large disks

[Ted Unangst <tedu@zeitbombe.org>]

On Sat, 13 Sep 2003, dkwok@iware.com.au wrote:

> 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.

16383/16/63 are the maximum possible values for those fields.  that's why 
disks use LBA and not CHS addressing.  fdisk fields are restricted to the 
limit, but the sector count can easily exceed their product.  just set the 
sector field to the correct values, and everything will work.


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