linux-kernel - Re: Detection of Advanced Format drives

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Message-ID: <yq11uv1dd6h.fsf@sermon.lab.mkp.net>
Date:	Tue, 27 Sep 2011 14:59:18 -0400
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Arun <engineerarun@...il.com>
Cc:	Joshua Scoggins <theoretically.x64@...il.com>,
	Mike Snitzer <snitzer@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: Detection of Advanced Format drives

>>>>> "Arun" == Arun  <engineerarun@...il.com> writes:

Arun> Should I suppose that it is an already available piece of
Arun> information to the userland? 

Yes, in the sysfs locations Mike mentioned:

  /sys/block/foo/queue/physical_block_size

Or you can use the BLKPBSZGET ioctl.


Arun> Or do I need to modify the hdparm/fdisk code to get this piece of
Arun> info?

Recent hdparm versions will also report the right thing:

# hdparm -I /dev/sdc | grep Sector
        Logical  Sector size:                   512 bytes
        Physical Sector size:                  4096 bytes
        Logical Sector-0 offset:                512 bytes

-- 
Martin K. Petersen	Oracle Linux Engineering
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