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There are several packet types that are documented within the system
include files that are obsolete.  A file system is not expected to
handle these packets and any program which sends these packets can
not expect them to work:

ACTION_DISK_CHANGE      33      <Obsolete>


ACTION_DISK_TYPE        32      <Obsolete>


ACTION_EVENT             6      <Obsolete>


ACTION_GET_BLOCK         2      <Obsolete>


ACTION_SET_MAP           4      <Obsolete>

Of particular note here is ACTION_DISK_CHANGE.  The DiskChange
command uses the ACTION_INHIBIT packet to accomplish its task.