--- b/sys/cam/scsi/scsi_cd.c	
+++ b/sys/cam/scsi/scsi_cd.c	
@@ -1032,7 +1032,8 @@ cdstart(struct cam_periph *periph, union ccb *start_ccb)
 		 * If the CD is already locked, we don't need to do this.
 		 * Move on to the capacity check.
 		 */
-		if ((softc->flags & CD_FLAG_DISC_LOCKED) != 0) {
+		if (softc->state == CD_STATE_MEDIA_PREVENT &&
+		    (softc->flags & CD_FLAG_DISC_LOCKED) != 0) {
 			softc->state = CD_STATE_MEDIA_SIZE;
 			xpt_release_ccb(start_ccb);
 			xpt_schedule(periph, CAM_PRIORITY_NORMAL);