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Re: How to debug 'out of disk' error.

From: Lennart Sorensen
Subject: Re: How to debug 'out of disk' error.
Date: Fri, 18 Mar 2011 10:22:53 -0400
User-agent: Mutt/1.5.18 (2008-05-17)

On Fri, Mar 18, 2011 at 10:04:42AM +0100, Grégoire Sutre wrote:
> I didn't look at the code, but this is probably the ATA geometry of
> the disk, which is returned by the INT-13h (Extended) function 48h
> (Read Drive Parameters).  If I remember correctly, this geometry is
> always 16383/16/63 for disks larger than 8.4GB.

That does match what is returned.

Grub later assumes H=255 if it falls back to CHS as far as I can tell.

H=255 S=63 would be really bad for alignment on SSDs and such (not that
H=16 is a whole lot better, but it is better).

Len Sorensen

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