Producing ISO from CDROM

Producing ISO from CDROM

[fred pasteck]

Hi everyone. I'm trying to dd a CDROM to produce an
ISO image using the following:

# dd if=/dev/hdc of=cdrom.iso

This works, and I can mount the resulting ISO using
the loop device, but there's an I/O error at the end:

# dd if=/dev/hdc of=cdrom.iso
dd: reading `/dev/hdc': Input/output error
1000480+0 records in
1000480+0 records out

It's apparently missing a byte or two because the MD5
sums don't match what they're supposed to be. What is
the best way to get an image from a CDROM?

Should I be using 512k blocks and the specific number
of blocks with the count= argument? My reason for
doing all of this is to verify the CDROM was burned to
correctly match that of the original ISO. Is there a
better way?

thanks.


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Re: Producing ISO from CDROM

[James]

On Sun, May 19, 2002 at 01:59:53PM -0700, fred pasteck wrote:
| 
| # dd if=/dev/hdc of=cdrom.iso
| dd: reading `/dev/hdc': Input/output error
| 1000480+0 records in
| 1000480+0 records out

This happens with me, but the resulting ISO always works... I just
ignored it.
 
| Should I be using 512k blocks and the specific number
| of blocks with the count= argument? My reason for

No, if anything you should be using blocks that are 2048 bytes since
that's what CDs use. Look that number up though, I might have got it
wrong.

-- 
I will not sell land in Florida  
 
6AD6 865A BF6E 76BB 1FC2 | www.piku.org.uk/public-key.asc
E4C4 DEEA 7D08 D511 E149 | www.piku.org.uk wnzrf@cvxh.bet.hx (rot13'd)

RE: Producing ISO from CDROM

[Michael French]

	I think this would work too, saw it in an article somewhere before.  Just
cat the device (/dev/hdc or whatever) and redirect the output to a file
mycdromfile.iso or something.  Maybe that will fix the problem.

Michael French

-----Original Message-----
From: linux-admin-owner@vger.kernel.org
[mailto:linux-admin-owner@vger.kernel.org]On Behalf Of James
Sent: Sunday, May 19, 2002 5:38 PM
To: linux-admin@vger.kernel.org
Subject: Re: Producing ISO from CDROM


On Sun, May 19, 2002 at 01:59:53PM -0700, fred pasteck wrote:
|
| # dd if=/dev/hdc of=cdrom.iso
| dd: reading `/dev/hdc': Input/output error
| 1000480+0 records in
| 1000480+0 records out

This happens with me, but the resulting ISO always works... I just
ignored it.

| Should I be using 512k blocks and the specific number
| of blocks with the count= argument? My reason for

No, if anything you should be using blocks that are 2048 bytes since
that's what CDs use. Look that number up though, I might have got it
wrong.

--
I will not sell land in Florida

6AD6 865A BF6E 76BB 1FC2 | www.piku.org.uk/public-key.asc
E4C4 DEEA 7D08 D511 E149 | www.piku.org.uk wnzrf@cvxh.bet.hx (rot13'd)
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