How to copy burned CDs?

**OErjan** · 05-11-2005, 05:42 PM

oops, i never spotted that, would have if i typed it but...
bs=1M means that the blocksize is 1Mb or 1024k...
which is slightly faster than the default 512b

**Dave_Bechtel** · 05-12-2005, 05:28 AM

BlockSize = 1 Meg; see ' man dd '. It speeds things up a bit if you use a higher blocksize than the default.

Originally Posted by A. Jorge Garcia

Dave, I figured you were referring to the "/mnt...."

BTW, what is bs=1M?

Thanx,
AJG

**A. Jorge Garcia** · 05-13-2005, 03:35 PM

OK, I just tried this proceedure

Code:

cat /dev/cdrom /mnt/hda3/iso/my.iso

using a newly knoppix-installer'ed PC (hd install of 3.8.1)

and I get these errors:

Code:

/dev/cdrom                     no such device or address
/mnt/hda3/iso/my.iso           no such file or directory

Do I have to mount the cdrom first? Is /dev/cdrom not the device that KNOPPIX 3.8.1 defines? I tried /dev/scd0 too as thats used during a liveCD bootup, still no joy.

Do I have to mount hda3 first? I'm already running KNOPPIX from hda3....

TIA,
AJG

**Dave_Bechtel** · 05-13-2005, 07:31 PM

Read the directions a little more closely... You forgot the ' > '

--BTW, trying scd0 was a good shot; I don't know why it didn't work. Try:

' cat /dev/sr0 > /mnt/hda3/iso/my.iso '

--If you can mount a CD from KDE, switch to a console window and ' df ' - that will tell you what device it's using.

Originally Posted by A. Jorge Garcia

OK, I just tried this proceedure

Code:

cat /dev/cdrom /mnt/hda3/iso/my.iso

using a newly knoppix-installer'ed PC (hd install of 3.8.1)

and I get these errors:

Code:

/dev/cdrom                     no such device or address
/mnt/hda3/iso/my.iso           no such file or directory

Do I have to mount the cdrom first? Is /dev/cdrom not the device that KNOPPIX 3.8.1 defines? I tried /dev/scd0 too as thats used during a liveCD bootup, still no joy.

Do I have to mount hda3 first? I'm already running KNOPPIX from hda3....

TIA,
AJG

**OErjan** · 05-13-2005, 07:32 PM

try incerting a little > in there.

cat /dev/cdrom>/mnt/hda3/iso/my.iso

and yes the hdd must be mounted.
hmm, can you mount a CD? if so try mounting a cd and
do a mount|grep cdrom this should give you the proper device.
so should cat /etc/fstab|grep cdrom.
dmesg|grep CD might help aswell.
heh, there are several waqys of finding what your CDrom is called.
and it should work. if not try the dd comand...

**A. Jorge Garcia** · 05-13-2005, 10:00 PM

OK, that's weird. I thought I used the >, maybe I didn't, sorry.... OOPS, let me try that again.

Code:

paul@Colossus:~$ cat /etc/fstab|grep cdrom
/dev/cdrom /mnt/cdrom  iso9660  defaults,ro,user,noexec,noauto  0  0
paul@Colossus:~$ dmesg|grep CD
hdc: SONY CD-RW CRX140E, ATAPI CD/DVD-ROM drive
  Vendor: SONY      Model: CD-RW  CRX140E    Rev: 1.0n
  Type:   CD-ROM                             ANSI SCSI revision: 02

BTW, mount|grep cdrom returned nothing as the cdrom was not mounted.

What's also strange is that my KNOPPIX system in hd installed to hda3. So, when it boots, isn't hda3 already mounted?

You, know, I never understood why all the partitions show up on the desktop when booting the liveCD and they don't when booting from a hd install.

Regards,
AJG

**A. Jorge Garcia** · 05-14-2005, 02:36 AM

...stranger and stranger

Well, I tried just this at home on a hd installed KNOPPIX 3.7 box. As a test case I burned a miniCDR (210MB) of BCCD 2.2.1 (200MB). Then I ran

Code:

cat /dev/scd0 > /mnt/hda2/home/iso/BCCD/test5.iso

and

Code:

dd if=/dev/scd0 of=/mnt/hda2/home/iso/BCCD/test4.iso bs=1M

and both worked - sort of.

Now the problem is that both runs produced isos 113.8MB in size, though dd was a bit faster, that obviously do not match the original md5sum!

What gives?

TIA,
AJG