read_drive
error = read_drive(drive, (void *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET);
error = read_drive(drive, (void *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET);
error = read_drive(drive, config_text, MAXCONFIG * 2, VINUM_CONFIG_OFFSET);