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From: David Rees <drees76@gmail.com>
Date: Wed, 27 Jan 2010 15:41:02 -0800
Message-ID: <72dbd3151001271541l7026389fgd2c91f9ee6502472@mail.gmail.com>
Subject: Re: [PATCH] ata: Disable NCQ for Crucial M225 brand SSDs
To: Vishal Rao <vishalrao@gmail.com>
Cc: Mark Lord <kernel@teksavvy.com>, Alan Cox <alan@lxorguk.ukuu.org.uk>,
       jgarzik@pobox.com, linux-ide@vger.kernel.org,
       linux-kernel@vger.kernel.org, trivial@kernel.org, stable@kernel.org
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On Wed, Jan 27, 2010 at 3:16 PM, Vishal Rao <vishalrao@gmail.com> wrote:
> 2010/1/28 Mark Lord <kernel@teksavvy.com>:
>> The errors in that log indicate bad media.
>> So the question is, can you demonstrate Win7rc NOT having the same
>> errors when accessing the SAME (logical) sectors ?
>
> Would that mean I have to blow away my precious ext4 partitions and
> have them Win7rc NTFS formatted and run a full check-disk with
> bad block checking enabled?

No - you just need a tool to do a full read of the partition.  You
could use the cygwin tools and dd, for example.

> In the mean time, can I run a linux command (please tell me what it is or
> I will search for something to run online) or tool while NCQ is disabled (via
> libata.force=noncq) that can do a disk scan with bad block checking?

badblocks <name of partition>

See the man page for more details, but that should do a read test -
may want to boot from a rescue disk or from another disk if possible
to run the test.

-Dave
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