Qualifiers

/ALLOCATION
      /ALLOCATION=n

   Specifies the allocation of a new virtual device file in terms
   of 512-byte blocks. The allocation specified is the number you
   entered as n. If you do not specify the /ALLOCATION qualifier
   when you create a new virtual device file, the default allocation
   is 494 blocks, the size of a single-density diskette. The maximum
   allocation is 65,536 blocks.

   A virtual device file is usually the size of a standard device
   supported by both RT-11 and OpenVMS. These sizes are as follows:

   Device    Blocks

   TU58      512
   RX01      494
   RX02      494 (single density)
   RX50      800
   RX02      988 (double density)
   RX33      2400
   RL02      20480
   RK06      27126
   RK07      53790

   You can also use the /ALLOCATION qualifier to reduce the size
   of a physical device. For example, if you want to prepare
   an RL02 disk but have only an RK07 device available, you can
   initialize the RK07 to a volume of 20,480 blocks. When the RL02
   is available, you can transfer the files to the RL02 knowing they
   will fit on the smaller device.


/BADBLOCKS
      /BADBLOCKS[=RETAIN]

   Performs a bad block scan of the volume before initialization. A
   file named FILE.BAD is created on top of each bad block or group
   of bad blocks encountered on the device, preventing any future
   use of the bad areas.

   If a bad block is found in either the boot block or the volume
   directory, the volume is not usable and EXCHANGE displays
   an error message. If the bad block is in a directory segment
   other than the first, you might be able to use the volume by
   reinitializing it with a smaller number of segments (see the
   /SEGMENTS qualifier description).

   If you specify /BADBLOCKS=RETAIN, EXCHANGE uses the device's
   existing bad block information, instead of performing a bad block
   scan. Therefore, initializing takes less time. If you do not
   specify RETAIN, EXCHANGE writes a pattern on each block of the
   volume, then reads each block to verify that the block is usable.
   EXCHANGE prints a list of the bad blocks found on the device.

   RK06, RK07, and RL02 disk volumes support bad block replacement.
   Therefore, VSI recommends that you use the /REPLACE=RETAIN
   qualifier for these volumes. If you use the /BADBLOCKS qualifier
   with a volume initializied previously with the /REPLACE
   qualifier, EXCHANGE deletes the bad block replacement table and
   performs a new bad block scan. If you use /BADBLOCKS=RETAIN with
   such a volume, EXCHANGE uses the FILE.BAD files created during
   the volume initialization.


/CREATE
   Specifies that a virtual device is to be created and initialized.
   The specification is a file name; if a file type is not given,
   EXCHANGE applies the default type of DSK.


/DENSITY
      /DENSITY=density-value

   Specifies, for magnetic tape volumes, the density in bytes per
   inch (bpi) at which the tape is to be written.

   For magnetic tape volumes, the density value specified can be 800
   or 1600, as long as the density is supported by the magnetic tape
   drive. If you do not specify a density value for a blank tape,
   the system uses a default of the lowest density supported by the
   tape drive.

   For the RX02 dual-density diskette drive, use the DCL command
   INITIALIZE/DENSITY=SINGLE or INITIALIZE/DENSITY=DOUBLE to
   reformat the diskettes to a different density; then use the
   EXCHANGE command INITIALIZE to create the RT-11 directory
   structure.

                                  NOTE

      Diskettes formatted in double density cannot be read or
      written by the console block storage device (an RX01 drive)
      of a VAX-11/780 until they have been reformatted in single
      density.


/EXTRA_WORDS
      /EXTRA_WORDS=n

   Specifies, for RT-11 volumes, the number of extra words to add
   to each directory entry, in addition to the required seven words.
   The ability to increase the length of directory entries is useful
   for some RT-11 applications. Increasing the size of the directory
   entries reduces the number of entries that fit in each directory
   segment.


/MESSAGE
      /MESSAGE
      /NOMESSAGE

   Controls whether or not EXCHANGE displays a message that the
   volume was initialized. The default is determined by the /MESSAGE
   qualifier entered with the EXCHANGE command when EXCHANGE was
   activated.


/REPLACE
      /REPLACE=RETAIN

   Retains, when an RT-11 volume is initialized, the bad block
   replacement table and any existing FILE.BAD files.

   The RETAIN option is required; EXCHANGE cannot build a
   replacement table for a volume. The RT-11 system builds and
   uses the table based on specific hardware error conditions. The
   OpenVMS I/O system is different, and cannot be relied upon to
   generate exactly the same error conditions. Therefore, it is not
   possible for EXCHANGE to generate the same replacement table that
   would be generated by RT-11.

   If no replacement table is present, the qualifier /REPLACE=RETAIN
   is equivalent to /BADBLOCKS=RETAIN.


/SEGMENTS
      /SEGMENTS=n

   Defines, for RT-11 volumes, the number of 2-block directory
   segments to allocate for the directory. The number of segments
   in the directory establishes the number of files that can be
   stored on a device. The system allows a maximum of 72 files
   per directory segment and 31 directory segments per device. The
   argument n represents the number of segments; the valid range for
   n is from 1 to 31 (decimal). The default values for n depend on
   the device type, as follows:

   Device    Segments

   TU58      1
   RX01      1
   RX02      1 (single density)
   RX02      4 (double density)
   RX50      4
   RX33      16
   RL02      16
   RK06      16
   RK07      31


/VOLUME_FORMAT
      /VOLUME_FORMAT=option

   Defines the physical format of the volume to be processed.

   The EXCHANGE command INITIALIZE is not valid for Files-11
   devices.