$ cat /proc/version
Linux version 2.6.18-274.18.1.el5xen (mockbuild@builder10.centos.org)
(gcc version 4.1.2 20080704 (Red Hat 4.1.2-51)) #1 SMP Thu Feb 9 13:27:02 EST 2012

$ cdrecord -scanbus
Cdrecord-Clone 2.01 (cpu-pc-linux-gnu) Copyright (C) 1995-2004 J�rg Schilling
Note: This version is an unofficial (modified) version with DVD support
Note: and therefore may have bugs that are not present in the original.
Note: Please send bug reports or support requests to http://bugzilla.redhat.com/bugzilla
Note: The author of cdrecord should not be bothered with problems in this version.
cdrecord: Invalid or incomplete multibyte or wide character. Cannot open SCSI driver.
cdrecord: For possible targets try 'cdrecord -scanbus'. Make sure you 
are root. cdrecord: For possible transport specifiers try 'cdrecord dev=help'.

$ cdrecord dev=help
Cdrecord-Clone 2.01 (cpu-pc-linux-gnu) Copyright (C) 1995-2004 J�rg Schilling
Note: This version is an unofficial (modified) version with DVD support
Note: and therefore may have bugs that are not present in the original.
Note: Please send bug reports or support requests to http://bugzilla.redhat.com/bugzilla
Note: The author of cdrecord should not be bothered with problems in this version.
Supported SCSI transports for this platform:

Transport name:         sg
Transport descr.:       Generic transport independent SCSI
Transp. layer ind.:
Target specifier:       bus,target,lun
Target example:         1,2,0
SCSI Bus scanning:      supported
Open via UNIX device:   not supported

Transport name:         pg
Transport descr.:       SCSI transport for ATAPI over Parallel Port
Transp. layer ind.:
Target specifier:       bus,target,lun
Target example:         1,2,0
SCSI Bus scanning:      supported
Open via UNIX device:   not supported

Transport name:         ATA
Transport descr.:       ATA Packet specific SCSI transport
Transp. layer ind.:     ATAPI:
Target specifier:       bus,target,lun
Target example:         ATAPI:1,2,0
SCSI Bus scanning:      supported
Open via UNIX device:   not supported

Transport name:         ATA
Transport descr.:       ATA Packet specific SCSI transport using sg interface
Transp. layer ind.:     ATA:
Target specifier:       bus,target,lun
Target example:         1,2,0
SCSI Bus scanning:      supported
Open via UNIX device:   not supported

Transport name:         RSCSI
Transport descr.:       Remote SCSI
Transp. layer ind.:     REMOTE:
Target specifier:       rscsi@host:bus,target,lun
Target example:         REMOTE:rscsi@host:1,2,0
SCSI Bus scanning:      supported
Open via UNIX device:   not supported