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Date: Mon, 6 Dec 2010 21:16:08 +0000
From: Bruce Cran <bruce@cran.org.uk>
To: Ivan Voras <ivoras@freebsd.org>
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Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
	src-committers@freebsd.org, Pawel Jakub Dawidek <pjd@freebsd.org>,
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Subject: Re: svn commit: r216230 -
 head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
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On Mon, Dec 06, 2010 at 09:31:39PM +0100, Ivan Voras wrote:
> For what it's worth, apparently linux has the concept of "physical"
> and "logical" sector sizes (possibly in addition to "stripe size"),
> with physical being 4096 and logical 512, for example:
> 
> # hdparm -I /dev/sde | grep size
> Logical  Sector size:                   512 bytes
> Physical Sector size:                  4096 bytes
> device size with M = 1024*1024:     1430799 MBytes
> device size with M = 1000*1000:     1500301 MBytes (1500 GB)

So do we, except they're both the same for Advanced Format drives:

# camcontrol identify /dev/ada1
...
device model		WDC WD10EARS-00Z5B1
...
sector size		logical 512, physical 512, offset 0

I don't know if Linux has a quirks list that 'corrects' the physical
sector size?

-- 
Bruce Cran