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

Andriy Gapon avg at
Tue Dec 7 23:41:27 UTC 2010

on 08/12/2010 01:11 Matthew Jacob said the following:
> Geometry is still important.  Trying booting a USB flash drive on all BIOS' with
> a 63/255 geometry instead of a 64/32 geometry.

Well, I don't know anything about USB...
My point about modern HDDs still stands.

> 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.

Andriy Gapon

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