iso-ing a disk

mimithebrain · 07-02-2005, 05:31 PM

Hi.

I'm burning a bunch of iso's into a disk, as files (and not images) for archiving purposes.

I have this Mandrake 10.1 disk. I used k3b to make an ISO out of it by using the DVD copying dialog, and saving the image as mdk10_1.iso ... I need to do this because I delete the image that I downloaded, and want it back by ISO-ing the physical disk.

when I md5 the new image, I get the wrong MD5...

So I delete the image, and md5sum /dev/cdrom instead. The MD5 is the correct one. I assume it's just an error and redo the image. When I MD5 the image again, it's still the incorrect, but same MD5 as before...

something I'm missing? What would be the better command line alternative to making an ISO?

Matir · 07-02-2005, 06:13 PM

Well, I've always used "dd if=/dev/cdrom of=MY_ISO.iso" to make them. Adding bs=8k can speed things up a bit. (Some drives may work better with other blocksizes, YMMV)

mimithebrain · 07-02-2005, 06:18 PM

I found the solution before reading this, but you are right

The command I used was :
dd if=/dev/cdrom of=mdk10_1.iso bs=2048 count=`isosize -d 2048 /dev/cdrom`

and it gives me the exact MD5...

thanks!

ilikejam · 07-02-2005, 06:23 PM

Hi.

Try:
dd if=/dev/cdrom of=/path/to/somewhere/mandy10.iso

Replace /dev/cdrom with whatever your DVD device is, and the /path/to something sensible. Of course.

Dave

Matir · 07-02-2005, 06:26 PM

As far as I know, you should be able to do it without the count of blocks: it will automatically end when it reaches the end of the disk.

cs-cam · 07-03-2005, 12:28 AM

I just use cat...

Code:

cat /dev/cdroms/cdrom0 > image.iso

mimithebrain · 07-03-2005, 10:40 AM

if I understand well, an iso is just an raw image of the media being copied?

No extra bah-ding-bah-dang in there?

cool, that's make things a lot simpler

ilikejam · 07-03-2005, 10:54 AM

Quote:

Originally posted by mimithebrain
if I understand well, an iso is just an raw image of the media being copied?

No extra bah-ding-bah-dang in there?

That's it exactly. It's an image of an ISO9660 filesystem, which is the filesystem that is used on CDs (and most DVDs).
You can also make images of any filesystem (including hard drives) using the same 'dd' command.

Dave

Matir · 07-03-2005, 11:05 AM

Or the same cat command. Don't you love how many different ways you can accomplish something in linux?

mimithebrain · 07-04-2005, 08:12 PM

Yup. It makes everything simpler when in linux, on a terminal.

Nice, well, that good to know. I worked with dd before when doing floppy copies and qemu.

ahhhhhhh... the simplicity ^-^