# mfsRamGetFreeSize

    Format:	s32 mfsRamGetFreeSize(void)
    Arguments:	None
    Return value:Size of free space (a negative value is an error)
    Function:	Obtains size of free space
    Description:	This function obtains the size of free space on the disk.  It calculates and returns the total block size of all unused blocks, in bytes.

    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
    	MFS_ERR_PROTECT	Write protected
    			The medium is volume protected.