[plug] mounting ext3 partition image

[tim.bowden at westnet.com.au]

---- Original Message ----
From: alastair at ucc.gu.uwa.edu.au
To: plug at plug.org.au
Subject: Re: [plug] mounting ext3 partition image
Date: Tue, 1 Apr 2008 11:11:48 +0800

>On Tue, 1 Apr 2008 10:04 am, tim.bowden at westnet.com.au wrote:
>> I'm having a little trouble mounting an image of an ext3
>> patition.  I created it on my laptop, saving it on my desktop
>> using:
>> dd conv=sync,noerror bs=64k if=/dev/sda2 |gzip |nc
>> 192.168.211.101 1010
>> Output:
>> 639964+1 records in
>> 639965+0 records out
>> 41940746240 bytes (42GB) copied, 4123.99 seconds, 10.2 MB/s
>>
>> and on the desktop:
>> nc -l -p 1010 |zcat | dd conv=sync,noerror bs=64k of=./sda2.img
>[snip errors]
>
>I suspect you shouldn't be using the "sync" conversion option.
>
>"info coreutils dd" said this:
>    `sync'
>        Pad every input block to size of `ibs' with trailing zero
>        bytes.  When used with `block' or `unblock', pad with spaces
>        instead of zero bytes.
>
>Since you're not reading from a tape, I suspect that only short 
>reads would result in this padding being done.  Therefore the 
>problem is almost certainly happening in the post-zcat part of the 
>second pipe.
>
>Also, `noerror' might be more trouble than it is worth.  

I put sync and noerror in because I'm particularly concerned with
recovering data from "free" parts of the partition, and google
indicated this would be a good thing.  I'm quite willing to
experiment without them however.

More info in reply to Bernd Felsche.

Tim

>
>-- 
>Alastair Irvine, Warpspace IT <http://www.warpspace.net/>
>Business enquiries: 1300 881744 or guru at warpspace.net
>[Linux Counter user #404151; OpenDocument Format Alliance member]
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