By default, units of KBYTES (1024 bytes) are used when specifying
    values for byte-count valued fields such as message quotas.

    To select a unit of measure other than KBYTES, use the SET
    STORAGE_UNITS command. BYTES selects bytes, KBYTES selects
    1024 bytes, MBYTES selects 1024 KBYTES, and GBYTES selects 1024
    MBYTES.

    After issuing a SET STORAGE_UNITS command, all byte-count valued
    numbers input on the command line will be interpreted as being
    measured in the newly selected units. Note that displayed values
    are displayed in the units called for by the formatting template
    used to generate the display.

    For example, to use units of megabytes, specify

    popstore> SET STORAGE_UNITS MBYTES