Re: ATA 4 KiB sector issues.

[H. Peter Anvin]

On 03/17/2010 08:08 AM, Ric Wheeler wrote:
> On 03/16/2010 06:21 PM, H. Peter Anvin wrote:
> > The only reason I see to care about CHS at all is that there are
> > systems in the field which can only boot from USB in CHS mode, and
> > which often look at the MBR partition table to guess the geometry. Of
> > course, some then *report* the detected geometry but don't *use* the
> > detected geometry...
>
> These systems, given the changes in modern microsoft releases, must be
> doomed even without any effort on our part.
>
> I still think that we should work to make this ancient stuff disappear &
> help force the legacy edge cases to modernize. It has been some huge
> amount of time since storage vendors pretty much abandoned CHS (15
> years? 20?) :-)

I wish.  This is mostly systems from the first half of the 2000's 
timeframe.  There was a *huge* regression when BIOS vendors started 
doing USB boot; almost all of them introduced major bugs at that time; 
in many cases they still haven't been fixed.

	-hpa
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