/sys$common/syshlp/helplib.hlb ANALYZE, /MEDIA, Qualifiers, /EXERCISE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  /EXERCISE=(FULL,[NO]KEEP,PATTERN)
  /NOEXERCISE (default)

   Controls whether the media should actually be tested. You can
   update the DBBF without erasing the contents of the volume by
   using the /NOEXERCISE qualifier along with the /BAD_BLOCKS
   qualifier.

   Qualifier Keywords

   FULL

        Causes BAD to test the media using three test patterns (0s,
        1s, and "worst case") instead of the default single "worst
        case" pattern. The FULL keyword can be used only with
        /EXERCISE.  Note that the "worst case" test pattern always
        remains on media tested with the /EXERCISE qualifier.

   KEEP

        Ensures the preservation of the current software detected bad
        block file (SDBBF). The keep keyword is the default when
        /NOEXERCISE is specified.

   NOKEEP

        Causes BAD to create a new SDBBF. The NOKEEP keyword is the
        default when /EXERCISE is specified. This keyword cannot be
        used with the /NOEXERCISE qualifier.

   PATTERN=(value[,...])

        Allows users to specify the value of a test pattern to be
        used as "worst case". Up to an octaword of test pattern
        data may be specified in decimal (%D), hexadecimal (%X),
        or octal (%O) radixes. The default radix is decimal.

        The pattern is specified in longwords. If two or more
        longwords are specified, they must be enclosed in
        parentheses and separated by commas.