Q. I can use dd command to create ISO images from a CD but how do I get volume information from CDs and ISO images from a shell prompt?
A. You can use the following commands:
[a] file – To determine file type.
Task: Read the volume data from an unmounted CD
Use the following command:
file -s /dev/scd0
Sample output:
/dev/scd0: ISO 9660 CD-ROM filesystem data UDF filesystem data (unknown version, id 'NSR01') 'Ubuntu 7.04 i386 ' (bootable)
Task: Read the table of contents of an unmounted CD
Use cdrecord:
cdrecord -v dev=/dev/scd0 -toc
Sample output:
TOC Type: 1 = CD-ROM scsidev: '/dev/scd0' devname: '/dev/scd0' scsibus: -2 target: -2 lun: -2 Linux sg driver version: 3.5.27 Wodim version: 1.1.6 SCSI buffer size: 64512 Device type : Removable CD-ROM Version : 5 Response Format: 2 Capabilities : Vendor_info : 'TSSTcorp' Identification : 'CD/DVDW SH-S182D' Revision : 'SB04' Device seems to be: Generic mmc2 DVD-R/DVD-RW. Current: 0x001A (DVD+RW) Profile: 0x0015 (DVD-R/DL sequential recording) Profile: 0x0016 (DVD-R/DL layer jump recording) Profile: 0x002B (DVD+R/DL) Profile: 0x001B (DVD+R) Profile: 0x001A (DVD+RW) (current) Profile: 0x0014 (DVD-RW sequential recording) Profile: 0x0013 (DVD-RW restricted overwrite) Profile: 0x0012 (DVD-RAM) Profile: 0x0011 (DVD-R sequential recording) Profile: 0x0010 (DVD-ROM) Profile: 0x000A (CD-RW) Profile: 0x0009 (CD-R) Profile: 0x0008 (CD-ROM) Profile: 0x0002 (Removable disk) Using generic SCSI-3/mmc DVD-R(W) driver (mmc_mdvd). Driver flags : SWABAUDIO BURNFREE Supported modes: PACKET SAO Drive buf size : 917504 = 896 KB Beginning DMA speed test. Set CDR_NODMATEST environment variable if device communication breaks or freezes immediately after that. Current Secsize: 2048 HINT: use dvd+rw-mediainfo from dvd+rw-tools for information extraction. first: 1 last 1 track: 1 lba: 0 ( 0) 00:02:00 adr: 1 control: 4 mode: -1 track:lout lba: 2295104 ( 9180416) -1:59:74 adr: 1 control: 7 mode: -1
Task: Read the volume data from an ISO image
Type the following command:
isoinfo -d -i /path/to/file.iso
isoinfo -d -i ubuntu-8.04-desktop-i386.iso
Sample output:
CD-ROM is in ISO 9660 format
System id: LINUX
Volume id: Ubuntu 8.04 i386
Volume set id:
Publisher id:
Data preparer id:
Application id: MKISOFS ISO 9660/HFS FILESYSTEM BUILDER & CDRECORD CD-R/DVD CREATOR (C) 1993 E.YOUNGDALE (C) 1997 J.PEARSON/J.SCHILLING
Copyright File id:
Abstract File id:
Bibliographic File id:
Volume set size is: 1
Volume set sequence number is: 1
Logical block size is: 2048
Volume size is: 357949
El Torito VD version 1 found, boot catalog is in sector 162
Joliet with UCS level 3 found
Rock Ridge signatures version 1 found
Eltorito validation header:
Hid 1
Arch 0 (x86)
ID ''
Key 55 AA
Eltorito defaultboot header:
Bootid 88 (bootable)
Boot media 0 (No Emulation Boot)
Load segment 0
Sys type 0
Nsect 4
Bootoff 9B 155
Task: Find the unique disk number from an unmounted CD
Type the command as follows:
cd-discid /dev/scd0
Sample output:
023bfd01 1 150 15359
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Wow. You guys rock. JSYK, cdrdao and ddpt are pretty cool too. Ddpt is a dd re-write that allows more direct access to hardware if the hardware has a SCSI pass-through interface. And cdrdao seemingly allows more direct access to the hardware without going through Linux’s hardware abstraction (because you can type something like “0,0,0” instead of “/dev/sr0” or “/dev/cdrom” of which the latter two are actual paths to files that link to the hardware through the kernel, i.e., hardware abstractions).
Oh … and the isoinfo -d -i command works with a hardware abstraction file to find such info off an actual CD, not just images, like such: isoinfo -d -i /dev/sr1
sample output:
CD-ROM is in ISO 9660 format
System id: CD-RTOS CD-BRIDGE
Volume id: BFN_PC
Volume set id:
Publisher id:
Data preparer id:
Application id: EASY CD CREATOR 4.2 (285) COPYRIGHT (C) 1996-2000 ADAPTEC, INC.
Copyright File id:
Abstract File id:
Bibliographic File id:
Volume set size is: 1
Volume set sequence number is: 1
Logical block size is: 2048
Volume size is: 85992
Joliet with UCS level 3 found
NO Rock Ridge present
Thank you, Guy! =)
This article is really useful!