1    /BLOCKS

       /BLOCKS={(START:n, COUNT:x, END:y,) FILE_SYSTEM, ALL}

    Directs the system to compare only the range specified. The
    options are the following:

    START:n     Number of the first block to be analyzed. The default
                is the first block.

    COUNT:x     Number of blocks to be analyzed. You can use this
                option in combination with or instead of the END
                option.

    END:y       Number of the last block to be analyzed. The default
                is the last block of the volume.

    FILE_       Blocks currently in use by valid files on the disk.
    SYSTEM      This is the default.

    ALL         All blocks on the disk.

    You can specify START,END,COUNT and either ALL or FILE_SYSTEM.
    For example, if you specify /BLOCKS=(START,END,COUNT:100,ALL),
    the software checks the first 100 blocks on the disk, whether or
    not the file system is using them.

    If you specify /BLOCKS=(START,END,COUNT:100,FILE_SYSTEM), the
    software checks only those blocks that valid files on the disk
    are using.

2    /BRIEF

    Displays only the logical block number (LBN) if the data in
    a block is found to be different. Without this qualifier, if
    differences exist for an LBN, the hexadecimal data of that block
    will be displayed for each member.

3    /IGNORE

       /IGNORE
       [NO]IGNORE

    Ignore "special" files that are likely to have some blocks with
    different data. These differences, however, are not unusual and
    can, therefore, be ignored.

    Other special files are the following:

       SWAPFILE*.*
       PAGEFILE*.*
       SYSDUMP.DMP
       SYS$ERRLOG.DMP

    IGNORE is the default.

4    /OUTPUT

       /OUTPUT=filename

    Output the information to the specified file.

5    /STATISTICS

    Display only the file header and footer. The best use of this
    qualifier is with the /OUTPUT qualifier.