From: Thomas Dodd <ted@cypress.com>
To: linux-kernel@vger.kernel.org, linux-usb-users@lists.sourceforge.net
Subject: Re: Problems accessing USB Mass Storage
Date: Tue, 17 Sep 2002 14:50:32 -0500 [thread overview]
Message-ID: <3D878788.2030603@cypress.com> (raw)
In-Reply-To: Pine.LNX.4.33L2.0209171119430.14033-100000@dragon.pdx.osdl.net
Mark C. Wrote:
>>> [root@stimpy dev]# dd if=/dev/sda of=/dev/null bs=1k count=1
>>> dd: reading `/dev/sda': Input/output error
>>> 0+0 records in
>>> 0+0 records out
Randy.Dunlap wrote:
> On Tue, 17 Sep 2002, Jonathan Corbet wrote:
>
> |
> | You might try just using dd to copy your card to disk with an offset of 25
> | sectors, and see of you can mount the resulting image.
>
> This is a bit like what we (JE, David Brownell, and I) saw at
> the USB plugfest in 1999. We had a camera device that we
> couldn't mount as a filesystem, but we could dd it.
> When we did that and studied the dd-ed file, we could see a
> FAT filesystem beginning after the first <N> blocks (but more than
> 25 sectors IIRC -- more like after 50-100 KB, or maybe even more).
See the above form Mark's post. He tried to dd a 1K block
and it failed. Granted, The first few blocks may need to be skipped,
but right now he cannot even get the raw data out.
If we can get the data, we can use the loop device to mount it.
Any ideas to figure out the why the dd fails?
-Thomas
next prev parent reply other threads:[~2002-09-17 19:46 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-17 18:15 Problems accessing USB Mass Storage Jonathan Corbet
2002-09-17 18:22 ` Randy.Dunlap
2002-09-17 19:46 ` Mark C
2002-09-17 20:12 ` jbradford
2002-09-17 21:21 ` Jonathan Corbet
2002-09-17 19:50 ` Thomas Dodd [this message]
2002-09-17 19:58 ` Matthew Dharm
2002-09-17 20:13 ` Thomas Dodd
2002-09-17 21:13 ` [Linux-usb-users] " Mark C
2002-09-17 21:40 ` Thomas Dodd
2002-09-17 21:51 ` Mark C
2002-09-17 21:58 ` Rogier Wolff
2002-09-17 22:17 ` Thomas Dodd
2002-09-17 22:23 ` Randy.Dunlap
2002-09-18 9:28 ` Andries Brouwer
2002-09-18 9:22 ` Andries Brouwer
-- strict thread matches above, loose matches on Subject: below --
2002-09-17 11:25 Mark C
2002-09-17 15:18 ` Greg KH
2002-09-17 17:37 ` Thomas Dodd
2002-09-17 17:46 ` Greg KH
2002-09-17 18:06 ` Richard B. Johnson
2002-09-17 20:09 ` Thomas Dodd
2002-09-17 21:01 ` Mark C
2002-09-17 21:43 ` Rogier Wolff
2002-09-17 22:04 ` Thomas Dodd
2002-09-17 22:21 ` Patrick Mansfield
2002-09-17 22:51 ` Mark C
[not found] ` <mailman.1032306001.9987.linux-kernel2news@redhat.com>
2002-09-18 1:37 ` Pete Zaitcev
2002-09-18 6:01 ` Rogier Wolff
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