Library /sys$common/syshlp/EXCHNGHLP.HLB  —  DISMOUNT  Parameters
 device-name[:]

    Specifies the name of the device to be dismounted. You can
    specify a physical device name or a logical name assigned to
    a physical device name. If you omit a controller designation
    or a unit number, the defaults are controller A and unit 0,
    respectively. You can also specify the name of a virtual device.
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