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From: Volker Armin Hemmann <volkerarmin@googlemail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user]  Re: USB drive dead? (Commands to check?)
Date: Sun, 20 Sep 2009 01:32:23 +0200
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On Sonntag 20 September 2009, walt wrote:
> On 09/19/2009 03:38 PM, Mark Knecht wrote:
> > On Sat, Sep 19, 2009 at 3:21 PM, Mark Knecht<markknecht@gmail.com>  wrote:
> >> Hi,
> >>    I seem to have lost an external USB drive I've been using on my
> >> MythTV backend server for video storage. What commands can I try to
> >> get it to wake up or at least show me what's working and what isn't?
> >> The drive shows under fdisk /dev/sda...
> 
> I hate to be the party poop, but I suspect disk hardware failure.
> 
> Can you use dd to read the raw disk?  e.g.
> # dd if=/dev/sda of=/tmp/ddout bs=512 count=1024(or whatever)
> 

he has block errors - dd won't help him much. ddrescue is a better choice in 
such circumstances.