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SCUZZ(8)										 SCUZZ(8)

       scuzz - SCSI target control

       scuzz [ -q ] [ target-id ]

       Scuzz  is  an interactive program for exercising raw SCSI devices.  It reads commands from
       standard input and applies them to a SCSI target.  If target-id is given  on  the  command
       line,  an open (see below) is immediately applied to the target.  On successful completion
       of a command, ok n is printed, where n is the number of bytes transferred to/from the tar-
       get; the -q command line option suppresses the ok message.

       help command
	      Help  is	rudimentary  and prints a one line synopsis for the named command, or for
	      all commands if no argument is given.

       probe  Probe attempts an inquiry command on all SCSI target ids,  and  prints  the  result
	      preceded by the id of those targets which respond.

       The help and probe commands may be given at any time.

       open target-id
	      Open  must  be given before any of the remaining commands will be accepted.  Inter-
	      nally, open issues ready then inquiry, followed by a device class-specific  command
	      to determine the logical block size of the target.

       close  Close need only be given if another target is to be opened in the current session.

       The remaining commands are in two groups, generic SCSI commands, and those specific to the
       Philips CDD521 Compact Disc Recorder (flushcache onwards).   With  the  exception  of  the
       read,  write, space, and wtrack commands, all arguments are in the style of ANSI-C integer

       ready  Test Unit Ready checks if the unit is powered up and ready to  do  read  and  write

       rezero Rezero Unit requests that a disc be brought to a known state, usually by seeking to
	      track zero.

       rewind Rewind positions a tape at the beginning of current  partition  (there  is  usually
	      only one partition, the beginning of tape).

	      Request  Sense  retrieves  Sense Data concerning an error or other condition and is
	      usually issued following the completion of a command that had check-condition  sta-
	      tus.  Scuzz automatically issues a reqsense in response to a check-condition status
	      and prints the result.

       format Format Unit performs a ``low level'' format of a disc.

	      Read Block Limits reports the possible block lengths for the  logical  unit.  Tapes

       read file nbytes
	      Read  transfers  data  from  the	target	to the host.  A missing nbytes causes the
	      entire device to be read.

       write file nbytes
	      Write transfers data from the host to the target.   A  missing  nbytes  causes  the
	      entire input file to be transferred.

	      The  first  argument  to	the  read, write, and wtrack (q.v.)  commands specifies a
	      source (write and wtrack) or destination (read)  for  the  I/O.	The  argument  is
	      either  a  plain file name or | followed by a command to be executed by rc(1).  The
	      argument may be quoted in the style of rc(1).

       seek offset whence
	      Seek requests the target to seek to a position on a disc, arguments  being  in  the
	      style of seek(2); whence is 0 by default.

	      Scuzz  maintains an internal notion of where the current target is positioned.  The
	      seek, read, write, rewind, rezero, and wtrack commands all manipulate the  internal

       filemark howmany
	      Write Filemarks writes one (default) or more filemarks on a tape.

       space [-b] [-f] [[--]howmany]
	      Space  positions a tape forwards or backwards.  The arguments specify logical block
	      (-b) or filemark (-f) spacing; default is -b.  If howmany is negative it	specifies
	      spacing backwards, and should be preceded by -- to turn off any further option pro-
	      cessing.	Default is 1.

	      Inquiry is issued to determine the device type  of  a  particular  target,  and  to
	      determine  some  basic  information  about  the implemented options and the product

       modeselect bytes...
	      Mode Select is issued to set variable parameters in the  target.	 Bytes	given  as
	      arguments  comprise  all the data for the target; see an appropriate manual for the

       modesense [page [nbytes]]
	      Mode Sense reports variable and fixed parameters from the target.  If  no  page  is
	      given, all pages are returned.  Nbytes specifies how many bytes should be returned.

       start code

       stop code

       eject code
	      Start, stop, and eject are synonyms for Start/Stop Unit with different default val-
	      ues of code.  Start/Stop Unit is typically used to spin up and spin down a rotating
	      disk  drive.   Code is 0 to stop, 1 to start and 3 to eject (if the device supports
	      ejection of the medium).

	      Read Capacity reports the number of blocks and the block size of a disc.

       The remaining commands are specific to the CDD521 Compact Disc Recorder.  A brief descrip-
       tion of each is given; see the manual for details of arguments.

	      The Flush Cache command forces data in the cache memory of the CDD521 to be written
	      to the physical medium.

       rdiscinfo [track/session-number[ses]]
	      The Read TOC/PMA command transfers data from one of the tables of contents (TOC  or
	      PMA) on the CD medium.

       fwaddr [track[mode[npa]]]
	      The  First  Writable  Address command reports the next logical writable address for
	      the next write command.

       treserve nbytes
	      The Reserve Track command reserves one track on  the  disc.   Tracks  can  only  be
	      reserved in successive order.

       trackinfo track
	      Read  Track  Info  reports the starting address, the length of a given track on the
	      disc and the number of free blocks in that track.

       wtrack file [nbytes [track [mode]]]
	      Write Track sets up for track-writing if nbytes is 0 (default), or  writes  a  com-
	      plete track.  See write above.


       unload Load and Unload open or close the tray.

       fixation [toc-type]
	      Fixation writes table of contents (TOC) and LEADOUT information to the disc to com-
	      plete a session.

	      raw SCSI interface for command and status.

	      raw SCSI interface for I/O.


       Small Computer System Interface - 2 (X3T9.2/86-109), Global Engineering Documents
       SCSI Command Set CDD521/10, Philips IMS
       SCSI Bench Reference, ENDL Publications

       Only a limited subset of SCSI commands has been implemented (as needed).

       Only one target can be open at a time.

       LUNs other than 0 are not supported.

       No way to force 6- or 10- byte commands.

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