1 DSC

 The  Disk  Save and Compress (DSC) utility program copies Files-11 disk
 volumes  to  tape  or disk for backup and storage.  When it is used for
 volume restoration, it reallocates and consolidates the resulting disk.
 
 The general form of the DSC command line is:
 
	outdev:[outlabel][/outswitches]=indev:[inlabel][/inswitches]
 
 outdev:	lists output device(s) to which data is transferred.
 
 indev:		lists the inputs device(s) from which data is taken.
 
 outlabel	Optional qualifier to change output volumn name.
 
 inlabel	Optional specifier for volumn lable for a tape containing
		multiple saved disks. Defaults to first image on the tape.
 
 outswitches	/AP, /BAD, /BL, /CMP, /DENS,  /RW, /VE
 inswitches	/BL /RW
 
		For more information, type  AID DSC switch
2 AP
 
 The /AP switch causes DSC to append a copy of the input device to the
 specified output magtape.  /AP is valid only if that tape is the first
 tape of the tape set.  The copy may extend to succeeding magtapes.
 
2 BAD
 
 There are five forms of the DSC switch /BAD.  They are:
 
	/BAD=MAN	Causes DSC to prompt for bad blocks to be added to
			the output volume's bad	block file, [0,0]BADBLK.SYS
 
	/BAD=MAN:NOAUTO	Combination of /BAD=MAN and /BAD=NOAUTO
		(Either order is acceptable)
 
	/BAD=NOAUTO	Causes DSC to ignore the bad block descriptor area on
			the disk.  The bad block file will be empty unless bad
			blocks are entered manually.
 
	/BAD=OVR	Causes DSC to treat output disk as a non-last track
			device when searching for bad block data.  Use this
			switch only if BAD utility was used specifying /OVR.

	/BAD=MAN:OVR	This is a combination of /BAD=MAN and /BAD=OVR

2 BL
 
 The blocking factor switch has the form of:
 
	/BL=n
 
 where n is the number of disk blocks that should be written at one time.
 The default is n=4, and 4 is the smallest value that should be specified.
 
 Specifying a large value for n decreases the amount of time necessary for
 the copy by reducing the number of required I/O commands.
 
 Once a blocking factor is specified, it becomes the default blocking factor
 until a new value is specified or until DSC exits.  If magtape is specified
 as the input device, the blocking factor is automatically set to the value
 at which that tape was created.
 
 If DSC will expand its partition to honor large values of n.
 It will not attempt to shrink its partition.
 
2 CMP
 
 The /CMP switch causes DSC to compare the input and output volumes without
 first performing a copy operation.  The input and output volumes cannot both
 be magtapes.  Multireel magtapes can be compared with a disk.  When the
 compare of the current tape is completed, the operation will continue on
 the next volume until all reels have been compared.
 
 If tape is involved, it is suggested that it be specified as input.

2 DENS
 
 The DSC density switch for magtapes has the following format:
 
	/DENS=1600		Specifies that the output magtape be written
				at 1600 bpi.  It is not	necessary to use this
				switch on input magtapes.
 
	/DENS=800:1600		The switch is not valid on any magtape
				controller which automatically senses density
				(e.g. TM03).  It specifies that the first two
				blocks on the first output tape be written at
				800 bpi. The remainder of the magtape set will
				be written at 1600 bpi.
 
		The default density for MM: tapes is 800 bpi,for MS:,1600
		bpi,and for MF:6250 bpi.
2 RW
 
 The /RW switch specifies to DSC that the magtapes be rewound before they are
 used. The switch applies to all tapes on the same side of the command line.

2 VE
 
 The /VE switch specifies to DSC that it should do a compare operation between
 the input and output volumes after the input volume is copied to the output
 volume.  The input and output volumes cannot both be magtapes.