linux-kernel - Re: USB storage: corrupted data transfers

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Date:	Sat, 10 Nov 2007 19:06:44 -0500
From:	Mark Lord <lkml@....ca>
To:	linux-usb-users@...ts.sourceforge.net,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	mdharm-usb@...-eyed-alien.net, dbrownell@...rs.sourceforge.net,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: USB storage: corrupted data transfers

Mark Lord wrote:
> Mark Lord wrote:
>> Something may be broken in USB / usb-storage land.
>>
>> I've got a 2GB USB stick here.
>> I want to copy it to an image file on my hard drive:
>>
>>    cat /dev/sdb > usbkey.image1
>>
>> Make a second copy, with or without unplugging/replugging the stick:
>>
>>    cat /dev/sdb > usbkey.image2
>>
>> After doing this, the two copies *differ*.
> 
> Here's the information on the specific devices I'm trying this with.
> 
> I'm beginning to suspect a faulty stick, or maybe one that just doesn't
> work reliably with the way Linux accesses it (?).  The type that fails
...

Yup, bad hardware.  I've got 13 of those sticks here, and 11 are fine.

Move along folks, nothing to see here..  :)
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