 
 BAD or the Bad Block Locator Utility tests disks and DECtapes for the
 location and number of bad blocks. BAD then records this bad block
 information on the volume for use by the MCR Initialize Volume (INI)
 command and by the backup and restore utilities.  The general form of
 the command line is:
 
	BAD>device:[/switch[es]]
 
 where:
	 device 	Specifies a physical device. The specification 
			consists of two alphanumeric characters followed 
			by a 1 to 3 digit octal unit number and colon.
 
         switch[es] 	Specifies one or more optional switches that 
			qualifies the BAD command line.  Multiple BAD 
			switches for a device must be specified on one 
			line.  If you do not specify a switch, BAD begins 
			pattern checking of individual blocks.
 
 For more information on switches, type HELP BAD SWITCHES.
2 SWITCHES
 Legal BAD switches are:
 
    /ALLOCATE:volume label     Prompts you for additional bad blocks to 
    /ALO:volume label          be allocated to [0,0]BADBLK.SYS and to be 
			       added to the bad block descriptor file.
 
    /LIST                      Lists all bad blocks by number (decimal) as 
    /LI                        they are located.
 
    /MANUAL                    Prompts you for additional bad blocks which
    /MAN		       are entered in the bad block descriptor file,
                               then searches the disk for bad blocks.
 
    /OVERRIDE 		       Ignores the last track information on a last
    /OVR                       track device, and creates bad block descriptor
                               file on the last good block before last track.
                          
 
    /PATTERN=m:n               Specifies the double word data pattern 
    /PAT=m:n                   used to locate bad blocks.
 
    /RETRY		       Force I/O driver to retry bad blocks
 
    /UPDATE                    Prompts you for additional bad blocks which
    or /UPD                    are added to the bad block descriptor file.
  
   Switches for Stand-Alone Version Only
 
    /CSR=nnnnnn                Specifies the CSR address of a device 
                               that is not in a standard location.
 
    /VEC=nnn	               Specifies the interrupt vector address of a
                               device that is not in a standard location.
 
    /WCHK		       Causes a write check.
 
    /NOCHK                     Negates /WCHK

