bash-3.00$ cdrecord -v scanbus           
/usr/bin/cdrecord.bin: No write mode specified.
/usr/bin/cdrecord.bin: Asuming -tao mode.
/usr/bin/cdrecord.bin: Future versions of cdrecord may have different drive dependent defaults.
/usr/bin/cdrecord.bin: Continuing in 5 seconds...
/usr/bin/cdrecord.bin: No CD/DVD-Recorder device specified.
Usage: /usr/bin/cdrecord.bin [options] track1...trackn

Use     /usr/bin/cdrecord.bin -help
to get a list of valid options.

Use     /usr/bin/cdrecord.bin blank=help
to get a list of valid blanking options.

Use     /usr/bin/cdrecord.bin dev=b,t,l driveropts=help -checkdrive
to get a list of drive specific options.

Use     /usr/bin/cdrecord.bin dev=help
to get a list of possible SCSI transport specifiers.
bash-3.00$