svn commit: r216269 - head/sys/geom/part

Matthew Jacob mj at
Tue Dec 7 23:11:48 UTC 2010

Geometry is still important.  Trying booting a USB flash drive on all 
BIOS' with a 63/255 geometry instead of a 64/32 geometry.

On 12/7/2010 2:14 PM, Andriy Gapon wrote:
> on 08/12/2010 00:05 Matthew Jacob said the following:
>> On 12/7/2010 1:54 PM, Andriy Gapon wrote:
>>> on 07/12/2010 22:46 Bruce Cran said the following:
>>>>     Don't warn if a partition appears not to be aligned on a track boundary.
>>>>     Modern disks use LBA and create a fake CHS geometry that doesn't have any
>>>>     relation to the on-disk layout of data.
>>> You repeated that statement, so I am picking on you :-)
>>> Can someone show me how/where exactly modern drives fakes CHS geometry?
>> cf cam_calc_geometry
> But that's not drive firmware code :-)
> It's us faking those parameters for ourselves for some unknown reason.
> Stupid us :-) But not the drives / manufacturers.

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