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

Andriy Gapon avg at
Tue Dec 7 21:54:22 UTC 2010

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?
Let me specifically ask that question about modern (S)ATA drives directly
connected to a system (controller).
My impression is at least since ATA-7 there is no mentioning of anything
CHS-related in the specification.  The fact that we keep reading and
interpreting some historically defined bytes that are now marked as
unused/reserved doesn't mean that those bytes actually mean anything.

Andriy Gapon

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