freebsd-dev/share/man/man9/cd.9

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.\"	John-Mark Gurney.  All rights reserved.
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.\"	$Id: cd.9,v 1.5 1997/03/07 02:53:34 jmg Exp $
.\"
.Dd February 1, 1997
.Dt CD 9
.Os FreeBSD
.Sh NAME
.Nm cd
.Nd device driver for SCSI subsystem
.Sh DESCRIPTION
The
.Nm
device driver provides the 
.Tn SCSI
subsystem a way to handle type 5
.Pq Dv T_READONLY
media.  Some drives don't behave as the driver expects.  See the section
QUIRKS for info on possible flags.
.Sh QUIRKS
Each
.Tn CD-ROM
device can have different interpretations of the
.Tn 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
.Xr scsiconf 9
for more information on how to add quirk entries.
.Bl -tag -width CD_Q_BCD_TRACKS
.It Dv 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.
.It Dv 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
.Pq tracks 10-15 are skipped
then you have a drive that is in need of this flag.
.El
.Sh FILES
.Bl -tag -width /sys/scsi/scsiconf.h -compact
.It Pa /sys/scsi/cd.c
files contains actual driver code
.It Pa /sys/scsi/scsiconf.h
contains the defines of the
.Dv CD_Q_xxx
quirk flags
.El
.Sh SEE ALSO
.Xr cd 4 ,
.Xr scsi 4 ,
.Xr scsiconf 9
.Sh HISTORY
The
.Nm
manual page first appeared in
.Fx 2.2 .
.Sh AUTHOR
This
manual page was written by John-Mark Gurney
.Aq gurney_j@efn.org .