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CD(9)		       FreeBSD Kernel Developer's Manual		 CD(9)

     cd	-- CDROM driver	for the	CAM SCSI subsystem

     The cd device driver provides a read only interface for CDROM drives
     (SCSI type	5) and WORM drives (SCSI type 4) that support CDROM type com-
     mands.  Some drives don't behave as the driver expects.  See the section
     QUIRKS for	info on	possible flags.

     Each CD-ROM device	can have different interpretations of the SCSI spec.
     This can lead to drives requiring special handling	in the driver.	The
     following is a list of quirks that	the driver recognize.  See scsiconf(9)
     for more information on how to add	quirk entries.

     CD_Q_NO_TOUCH    This flag	tell the driver	not to probe the drive at
		      attach time to see if there is a disk in the drive and
		      find out what size it is.	 This flag is currently	unim-
		      plemented	in the CAM cd driver.

     CD_Q_BCD_TRACKS  This flag	is for broken drives that return the track
		      numbers in packed	BCD instead of straight	decimal.  If
		      the drive	seems to skip tracks (tracks 10-15 are
		      skipped) then you	have a drive that is in	need of	this

     CD_Q_NO_CHANGER  This flag	tells the driver that the device in question
		      is not a changer.	 This is only necessary	for a CDROM
		      device with multiple luns	that are not a part of a

     CD_Q_CHANGER     This flag	tells the driver that the given	device is a
		      multi-lun	changer.  In general, the driver will figure
		      this out automatically when it sees a LUN	greater	than
		      0.  Setting this flag only has the effect	of telling the
		      driver to	run the	initial	read capacity command for LUN
		      0	of the changer through the changer scheduling code.

     /sys/cam/scsi/scsi_cd.c  is the driver source file.

     cd(4), scsi(4)

     The cd manual page	first appeared in FreeBSD 2.2.

     This manual page was written by John-Mark Gurney <>.  It
     was updated for CAM and FreeBSD 3.0 by Kenneth Merry <>.

FreeBSD	11.0		       October 10, 1998			  FreeBSD 11.0


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