sec_num          2238 dev/ic/wdc.c   	wdc_c.r_sector = wi->wi_atareq.sec_num;
sec_num          2271 dev/ic/wdc.c   			wi->wi_atareq.sec_num = wdc_c.r_sector;
sec_num            15 sys/ataio.h    	u_char	sec_num;	/* sector number */