# mfsRamGetVolumeRC

    Format:	s32 mfsRamGetVolumeRC(void)
    Arguments:	None
    Return value:Update counter value (a negative value is an error)
    Function:	Obtains update counter value
    Description:	This function obtains the update counter value.
    The update counter is incremented when file, directory, or disk information has been changed in some way.
    Therefore, it can be used, for example, as a random number seed or to check whether or not the disk contents have been changed illegally.
    The update counter is a 16-bit value.

    The update counter only exists in the RAM area.

    Main errors:
    	MFS_ERR_NOTMFSDISK Not an MFS-format disk
    			The disk ID's disk use is not 1, or the header is different.
    	MFS_ERR_VERSION	Different version disk