cdrw(1) User Commands cdrw(1)
cdrw - CD read and write
cdrw -i [-vSCO] [-d device] [-p speed] [image-file]
cdrw -a [-vSCO] [-d device] [-p speed] [-T audio-type] audio-file1
cdrw -x [-v] [-d device] [-T audio-type] track-number out-file
cdrw -c [-vSC] [-d device] [-p speed] [-m tmp-dir]
cdrw -b [-v] [-d device] all | session | fast
cdrw -L [-v] [-d device]
cdrw -M [-v] [-d device]
cdrw -l [-v]
The cdrw command provides the ability to create data and audio CDs. This command also pro-
vides the ability to extract audio tracks from an audio CD and to create data DVDs. The CD
or DVD device must be MMC-compliant to create a CD or DVD with the cdrw command.
cdrw searches for a CD or DVD writer connected to the system, unless you specify a device
with the -d option. If cdrw finds a single such device, it uses that device as the default
CD or DVD writer for the command.
When more than one CD or DVD writer is connected to the system, use the -d option to indi-
cate which device is desired. The device name can be specified in one of the following
ways: /dev/rdsk/cNtNdNsN, cNtNdNsN, cNtNdN, or a name used by volume manager, such as
cdrom or cdrom1. Using the -l option provides a list of CD or DVD writers.
For instructions on adding a USB-mass-storage-class-compliant CD-RW or DVD-RW device to
your system, see scsa2usb(7D).
Creating Data CDs
When creating data CDs, cdrw uses the Track-At-Once mode of writing. Use the -i option to
specify a file that contains the data to write on CD media. If you don't specify this
option, cdrw reads data from standard input.
In either case, the data is typically prepared by using the mkisofs command to convert the
file and file information into the High Sierra format used on CDs. See the examples that
include use of this command.
Creating Data DVDs
cdrw can create single-session data DVDs on DVD+RW or DVD-RW devices using images gener-
ated from mkisofs. These disks can be mounted as HSFS file systems. When making data DVDs,
cdrw uses Disk-At-Once (DAO) mode of writing, which closes the media when writing is com-
pleted and prevents any further sessions from being added. The image should be prepared in
advance when writing an image to the DVD media since DAO mode requires that the size of
the image be known in advance.
Creating Audio CDs
Use the -a option to create an audio CD. Single or multiple audio files can be specified
with this option. All of the audio files should be in a supported audio format. Currently
approved formats are:
sun Sun .au files with data in Red Book CDDA form
wav RIFF (.wav) files with data in Red Book CDDA form
cda .cda files having raw CD audio data (that is, 16 bit PCM stereo at 44.1 KHz sample
rate in little-endian byte order)
aur .aur files having raw CD data in big-endian byte order
If no audio format is specified, cdrw tries to identify the audio file format based on the
file extension. The case of the characters in the extension is ignored. If a format is
specified using the -T option, it is assumed to be the audio file type for all the files
specified. Also, using the -c option closes the session after writing the audio tracks.
Therefore, the tracks to be written should be specified in a single command line.
cdrw can also be used for extracting audio data from an audio CD with the -x option. The
CD should have tracks in Red Book CDDA form. By default, the output format is based on the
file extension. A user can specify a sun, wav, cda, or aur output format with the -T
cdrw can be used to copy single session data CD-ROMs and Red Book audio CDs. When copying
a CD, cdrw looks for a specified source device. If no source device is specified when
using the -c option, the current CD writer is assumed to be the source. cdrw extracts the
track or tracks into a temporary file and looks for a blank writable CD-R/RW media in the
current CD writer. If no media is found, insert a blank writable CD media in the current
CD writer. If the default temporary directory does not have enough space, an alternate
directory can be specified by using the -m option.
Erasing CD-RW or DVD-RW Media
Users have to erase the CD-RW media before it can be rewritten. With the -b option, the
following flavors of erasing are currently supported:
session Erases the last session.
fast Minimally erases the media.
all Erases the entire media.
If the session erasing type is used, cdrw erases the last session. If there is only one
session recorded on the CD-RW (for example, a data or audio CD-RW created by this tool),
then session erasing only erases the portion that is recorded, leaving behind a blank
disk. This is faster than erasing the entire media. For DVD media, using the -b session
erases the whole media.
The fast erasing type minimally erases the entire media by removing the PMA and TOC of the
first session. It does not erase the user data and subsequent tracks on the media, but the
media is treated as if it were a blank disk. If a complete erase is of the media is neces-
sary, use the all option.
The all erasing type should be used if it is a multisession disk, the last session is not
closed, or disk status is unknown, and you want to erase the disk. With this type of eras-
ing, cdrw erases the entire disk.
DVD+RW media does not support erasing. To re-use DVD+RW media, simply write a new image
onto the media. cdrw formats and overwrites the existing media automatically.
Checking device-list or media-status
You can list a system's CD or DVD writers by using the -l option. Also, for a particular
media, you can get the blanking status and table of contents by using the -M option. The
-M option also prints information about the last session's start address and the next
writable address. This information, along with the -O option, can be used to create multi-
session CDs. Refer to the mkisofs(8) man page, (/usr/share/man/man8/mkisofs.8), in the
SUNWfsman package for more information.
The following options are supported:
-a Creates an audio disk. At least one audio-file name must be specified. A CD can not
have more than 99 audio tracks, so no more than 99 audio files can be specified.
-b Blanks CD-RW or DVD-RW media. The type of erasing must be specified by the all,
fast, or session argument. DVD+RW media does not support blanking, but can be
rewritten without the need for blanking.
-c Copies a CD. If no other argument is specified, the default CD writing device is
assumed to be the source device as well. In this case, the copy operation reads the
source media into a temporary directory and prompts you to place a blank media into
the drive for the copy operation to proceed.
-C This option is obsolete.
This option used to causecdrw to query the drive to determine media capacity. This
is now the default behavior.
-d Specifies the CD or DVD writing device.
-h Help. Prints usage message.
-i Specifies the image file for creating data CDs or DVDs. The file size should be less
than what can be written on the media. Also, consider having the file locally avail-
able instead of having the file on an NFS-mounted file system. The CD writing
process expects data to be available continuously without interruptions.
-l Lists all the CD or DVD writers available on the system.
-L Closes the disk. If the media was left in an open state after the last write opera-
tion, it is closed to prevent any further writing. This operation can only be done
on re-writable CD-RW media.
-m Uses an alternate temporary directory instead of the default temporary directory for
storing track data while copying a CD or DVD. An alternate temporary directory might
be required because the amount of data on a CD can be huge. For example, the amount
of data can be as much as 800 Mbytes for an 80 minute audio CD and 4.7 Gbytes for a
DVD. The default temporary directory might not have that much space available.
-M Reports media status. cdrw reports if the media is blank or not, its table of con-
tents, the last session's start address, and the next writable address if the disk
is open. DVD+RW does not support erasing and always has some content on the media.
-O Keeps the disk open. cdrw closes the session, but it keeps the disk open so that
another session can be added later on to create a multisession disk.
-p Sets the CD writing speed. For example, -p 4 sets the speed to 4X. If this option is
not specified, cdrw uses the default speed of the CD writer. If this option is spec-
ified, cdrw tries to set the drive write speed to this value, but there is no guar-
antee of the actual speed that is used by the drive.
-s Specifies the source device for copying a CD or DVD.
-S Simulation mode. In this mode, cdrw operates with the drive laser turned off, so
nothing is written to the media. Use this option to verify if the system can provide
data at a rate good enough for CD writing.
CD-R, CD-RW (not MRW formatted), DVD-R, and DVD-RW media support simulation mode
(-S). DVD-RAM, DVD+R, DVD+RW, any MRW-formatted media, and some others do not sup-
port simulation mode (-S).
-T Audio format to use for extracting audio files or for reading audio files for audio
CD creation. The audio-type can be sun, wav, cda, or aur.
-v Verbose mode.
-x Extracts audio data from an audio track.
Example 1 Creating a Data CD or DVD
example% cdrw -i /local/iso_image
Example 2 Creating a CD or DVD from a Directory
This example shows how to create a CD or DVD from the directory tree /home/foo.
example% mkisofs -r /home/foo 2>/dev/null | cdrw -i -p 1
Example 3 Extracting an Audio Track Number
This example shows how to extract audio track number 1 to /home/foo/song1.wav.
example% cdrw -x -T wav 1 /home/foo/song1.wav
Example 4 Using wav Files
This example shows how to create an audio CD from wav files on disk.
example% cdrw -a song1.wav song2.wav song3.wav song4.wav
Example 5 Erasing CD-RW or DVD-RW Media
This example shows how to erase rewritable media.
example% cdrw -b all
Example 6 Creating a Data CD or DVD with Multiple Drives
This example shows how to create a data CD or DVD on a system with multiple CD, DVD-R, or
example% cdrw -d c1t6d0s2 -i /home/foo/iso-image
Example 7 Checking Data Delivery Rate
This example shows how to verify that the system can provide data to a CD-RW or a DVD
drive at a rate sufficient for the write operation.
example% cdrw -S -i /home/foo/iso-image
Example 8 Running at a Higher Priority
This example shows how to run cdrw at a higher priority (for root user only).
example# priocntl -e -p 60 cdrw -i /home/foo/iso-image
Example 9 Creating a Multi-session Disk
This examples shows how to create the first session image by using mkisofs and recording
it onto the disk without closing the disk.
example% cdrw -O -i /home/foo/iso-image
Additional sessions can be added to an open disk by creating an image with mkisofs using
the session start and next writable address reported by cdrw.
example% cdrw -M
Track No. |Type |Start address
1 |Data | 0
Leadout |Data | 166564
Last session start address: 162140
Next writable address: 173464
example% mkisofs -o /tmp/image2 -r -C 0,173464 -M \
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|Availability |SUNWcdrw |
audioconvert(1), priocntl(1), policy.conf(4), attributes(5), rbac(5), scsa2usb(7D), sd(7D)
mkisofs(8), (/usr/share/man/man8/mkisofs.8), in the SUNWfsman package
System Administration Guide: Devices and File Systems
The CD writing process requires data to be supplied at a constant rate to the drive. Keep
I/O activity to a minimum and shut down any related I/O applications while writing CDs.
When making copies or extracting audio tracks, use an MMC compliant source CD-ROM drive.
The CD writer can be used for this purpose.
Before writing a CD, ensure that the media is blank by using the -M option. You can use
the -S simulation mode to test the system to make sure it can provide data at the required
rate. cdrw turns on buffer underrun protection for drives that support it and recovers
from most stalls. If the system is not able to provide data at a constant rate or frequent
stalling occurs, you can lower the speed by using the -p option. You can also try to run
cdrw at a higher priority by using the priocntl(1) command.
If you know that the CD-R/RW drive can operate at different write speeds, use the -p
option. Some commercially available drives handle the drive speed setting command differ-
ently, so use this option judiciously.
The cdrw command uses rbac(5) to control user access to the devices. By default, cdrw is
accessible to all users but can be restricted to individual users. Refer to the System
Administration Guide: Devices and File Systems for more information.
To burn CDs as a non-root user hal must be enabled and the user must be on the console.
hal, that is the svc:/system/hal SMF service, is enabled by default, therefore, typically
this requires no special action.
The user must be logged onto the console. /dev/console is also correct. Previously, users
could log in remotely, for example, by using telnet or ssh, and be able to burn CDs. This
would work unless the administrator had changed the default configuration to deny
solaris.device.cdrw authorization. See policy.conf(4).
SunOS 5.11 10 Jul 2008 cdrw(1)