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NAME

     atapicam - CAM XPT (transport) module for ATAPI devices

SYNOPSIS

     device atapicam

DESCRIPTION

     The ATAPI/CAM module allows ATAPI devices (CD-ROM, CD-RW, DVD drives,
     floppy drives such as Iomega Zip, tape drives) to be accessed through the
     SCSI subsystem, cam(4).

     ata(4) and scbus(4) must be configured in the kernel as well.  The SCSI
     target drivers (cd(4), da(4), or st(4)) can then be used to access the
     devices.  The generic passthrough device, pass(4), can also be used to
     send SCSI commands directly to the devices through the CAM API.

     A separate CAM bus is created for each ATA bus in the system.  On each of
     these buses, target ID 0 is assigned to the master device, and ID 1 is
     assigned to the slave (provided they are ATAPI devices).

IMPLEMENTATION NOTES

     Some SCSI commands are intercepted by the driver, and undergo special
     processing in order to work around limitations of ATAPI devices.  Such
     limitations can be consequences of the ATAPI specification.  For example,
     ATAPI devices do not implement the 6-byte versions of MODE_SELECT,
     MODE_SENSE, READ, or WRITE.  They can also be common bugs, such as
     hanging when queried for extended INQUIRY information.

EXAMPLES

           device ata
           device atapicam
           device scbus
           device cd
           device pass

     Add the atapicam driver to the kernel.

           camcontrol devlist

     Print the list of all devices available through CAM.

           mount -t cd9660 /dev/cd0 /mnt

     Mount a CD-ROM from an ATAPI CD-ROM drive (the command above assumes that
     the ATAPI drive is the only CD-ROM unit).

SEE ALSO

     ata(4), cam(4), scsi(4), atacontrol(8), camcontrol(8)

HISTORY

     The ATAPI/CAM driver first appeared in FreeBSD 4.8 and FreeBSD 5.0.

AUTHORS

     The ATAPI/CAM driver was written by Thomas Quinot 〈thomas@FreeBSD.org〉.

BUGS

     atapicam and ATAPI-specific target drivers (acd(4), ast(4), and afd(4))
     can be configured in the same kernel.  Simultaneous access to the same
     device through the SCSI generic drivers and the ATAPI-specific drivers
     may cause problems and is strongly discouraged.