Using 'incorrect' HD geometry.
jerrymc at clunix.cl.msu.edu
Tue Mar 14 00:49:27 UTC 2006
> I'm currently dual booting FreeBSD-5.3 and Windows 2000 on a WD800BB
> 80GB IDE HD. It all seems to be working very well, but now I want to
> install 6.0 on the slice where 5.3 is. fdisk -s currently says:
Nowdays, the geometry on the drives seems to be 'virtual' and so
you should just let the installer/fdisk do what it wants and leave
it that way. If it doesn't work the way the installer wants to
then there may be a problem. But if it works, just ignore the warnings.
> /dev/ad0: 155061 cyl 16 hd 63 sec
> Part Start Size Type Flags
> 1: 63 5981220 0x0b 0x00
> 2: 5981283 13971447 0xa5 0x80
> 3: 19958400 136337040 0x0f 0x00
> The problem is that the installer says that geometry of 155061/16/63
> is incorrect and suggests using the BIOS geometry of 38309/16/255.
> I'm worried that if I change the geometry I may lose the existing
> Win2k slices (1 and 3 in the fdisk output). I'm not even convinced
> that what the BIOS says is correct, as I get the following from other
> 16383/16/63 from the Western Digital web site.
> 10337/240/63 probed values from Scisoft Sandra.
> 10337/240/63 " " " Ranish Partition Manager.
> If I make sure the installer uses the existing incorrect geometry,
> does that guarantee that the other slices will be unaffected?
> What future problems may that lead to?
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