Re: RFC: disk geometry via sysfs

[Phillip Susi]

Alan Cox wrote:
> On Mer, 2006-02-15 at 10:01 +0100, Seewer Philippe wrote:
>   
> > This would mean dropping the HDIO_GETGEO ioctl completely and force
> > applications such as fdisk/sfdisk and even dosemu to determine disk
> > geometry for themselves. Which I think actually would be the most
> > correct approach.
> >     
>
> In the IDE case the drive geometry has meaning in certain cases,
> specifically the C/H/S drive addressing case with old old drives. 

I thought that C/H/S addressing was purely a function of int 13, not the 
hardware interface?  If it is a function of some older hardware 
interfaces, then we are still talking about two different, and likely 
incompatible geometries:  the one the disk reports, and the one the bios 
reports.  The values in the MBR must be the values the bios reports. 


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