cmd_clear            td_changestate       td_motor 
 cmd_read             td_eject             td_protstatus 
 cmd_update           td_format            td_rawread 
 cmd_write            td_getdrivetype      td_rawwrite 
 td_addchangeint      td_getgeometry       td_remchangeint 
 td_changenum         td_getnumtracks      td_seek