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Collaborative Computational Project Number 14

for Single Crystal and Powder Diffraction


Using dd (instead of cdrecord and dvdrecord) to write bootable ISO images to DVD-RAM disks

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Why note this info down

Because prior to obtaining this information, I was in a world of pain - others might be as well. At time of writing (May 2002) dvdrecord does not recognise the MATSHITA 'DVD-RAM LF-D310 ' DVDRAM drive being used and cdrecord-prodvd will only write small ISO images to DVDRAM drives - not multiple Gig ISO images.

Thanks to Seth Kurtzberg at MIS Corp for passing the advice for using dd instead.

Make the Atapi/IDE DVD-RAM device look like a SCSI device

(this is optional using the dd method of writing to the DVD-RAM disk but not if you want to use dvdrecord and cdrecord

For Redhat 7.3, to have the IDE/Atapi DVD-RAM device look like a SCSI device, :

Find out what device the DVDRAM is (in this case /dev/hdd - hdd)

Edit the /etc/lilo.conf (assuming you are using lilo.conf) and add the appropriate line such as append=" hdd=ide-scsi" after the "read-only" statement. E.g.,



Type lilo -v for this to update the boot setup then reboot.

Then do the following as root to make sure this has worked:

cdrecord -scanbus which should tell that this has worked.

Check that Redhat 7.3 has relinked the DVDram correctly by doing ls -al /dev/cd*

[root@mill dev]# ls -al cd*
lrwxrwxrwx    1 root     root            8 May 10 12:24 cdrom -> /dev/hdc
lrwxrwxrwx    1 root     root            9 May 10 16:39 cdrom1 -> /dev/scd0

If not do (in this example):

ln -sf /dev/scd0 /dev/cdrom1

Running as root:

cdrecord -scanbus

should now see the Atapi/IDE DVDRAM device as a SCSI device as per the following:

[root@mill root]# cdrecord -scanbus
Cdrecord 1.10 (i686-pc-linux-gnu) Copyright (C) 1995-2001 Jörg Schilling
Linux sg driver version: 3.1.22
Using libscg version 'schily-0.5'
        0,0,0     0) *
        0,1,0     1) *
        0,2,0     2) 'SEAGATE ' 'ST373405LC      ' '0002' Disk
        0,3,0     3) 'SEAGATE ' 'ST336737LC      ' '0105' Disk
        0,4,0     4) *
        0,5,0     5) *
        0,6,0     6) *
        0,7,0     7) *
        1,0,0   100) 'MATSHITA' 'DVD-RAM LF-D310 ' 'A112' Removable CD-ROM
        1,1,0   101) *
        1,2,0   102) *
        1,3,0   103) *
        1,4,0   104) *
        1,5,0   105) *
        1,6,0   106) *
        1,7,0   107) *
[root@mill root]#

Using cdrecord dev=1,0,0 -toc

[root@mill root]# cdrecord dev=1,0,0 -toc
Cdrecord 1.10 (i686-pc-linux-gnu) Copyright (C) 1995-2001 Jörg Schilling
scsidev: '1,0,0'
scsibus: 1 target: 0 lun: 0
Linux sg driver version: 3.1.22
Using libscg version 'schily-0.5'
Device type    : Removable CD-ROM
Version        : 0
Response Format: 2
Capabilities   :
Vendor_info    : 'MATSHITA'
Identifikation : 'DVD-RAM LF-D310 '
Revision       : 'A112'
Device seems to be: Generic mmc2 DVD.
Using generic SCSI-3/mmc CD driver (mmc_cd).
Driver flags   : SWABAUDIO
first: 1 last 1
track:   1 lba:         0 (        0) 00:02:00 adr: 1 control: 4 mode: -1
track:lout lba:   1218960 (  4875840) -1:59:74 adr: 1 control: 4 mode: -1

Installing UDFtools (this is optional)

Download the following; compile and install in your (latest) linux distribution.

Formatting and using dd to write a bootable ISO image to DVD-RAM (in this case the device in on /dev/scd0)

  • This seems to be optional - but good information to know about) mkudffs - Format a device, creating an empty UDF filesystem
    • mkudffs --media-type=dvdram /dev/scd0
    • (Or if CD-RW): mkudffs --media-type=cdrw /dev/scd0

  • Rather than the above: try mke2fs -b 2048 /dev/scd0 to create a blank filesystem or wipe the previous disk.

  • Then to write the ISO image (in this case created by mondorescue), do
    • dd if=/tmp/isos/1.iso of=/dev/scd0

      (make sure you are writing to a valid device or you will fill up your /dev area pretty quickly)

Infrormation on making bootable CDs on Linux

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