diff -up hdparm-9.60/sgio.c.bak hdparm-9.60/sgio.c
--- hdparm-9.60/sgio.c.bak	2019-01-03 23:37:54.000000000 +0100
+++ hdparm-9.60/sgio.c	2021-04-07 16:10:36.971836569 +0200
@@ -17,6 +17,10 @@
 
 #include <linux/hdreg.h>
 
+#ifndef DEMAND_SENSE_DATA
+	#define DEMAND_SENSE_DATA 0
+#endif
+
 extern int verbose;
 extern int prefer_ata12;
 
@@ -193,7 +197,7 @@ int sg16 (int fd, int rw, int dma, struc
 	unsigned char cdb[SG_ATA_16_LEN];
 	unsigned char sb[32], *desc;
 	struct scsi_sg_io_hdr io_hdr;
-	int prefer12 = prefer_ata12, demanded_sense = 0;
+	int prefer12 = prefer_ata12;
 
 	if (tf->command == ATA_OP_PIDENTIFY)
 		prefer12 = 0;
@@ -306,14 +310,16 @@ int sg16 (int fd, int rw, int dma, struc
 
 	desc = sb + 8;
 	if (io_hdr.driver_status != SG_DRIVER_SENSE) {
-		if (sb[0] | sb[1] | sb[2] | sb[3] | sb[4] | sb[5] | sb[6] | sb[7] | sb[8] | sb[9]) {
-			static int second_try = 0;
-			if (!second_try++)
+		static int second_try = 0;
+		if (!second_try++) {
+			if (sb[0] | sb[1] | sb[2] | sb[3] | sb[4] | sb[5] | sb[6] | sb[7] | sb[8] | sb[9]) {
 				fprintf(stderr, "SG_IO: questionable sense data, results may be incorrect\n");
-		} else if (demanded_sense) {
-			static int second_try = 0;
-			if (!second_try++)
+			}
+#if DEMAND_SENSE_DATA
+			else {
 				fprintf(stderr, "SG_IO: missing sense data, results may be incorrect\n");
+			}
+#endif
 		}
 	} else if (sb[0] != 0x72 || sb[7] < 14 || desc[0] != 0x09 || desc[1] < 0x0c) {
 		if (verbose || tf->command != ATA_OP_IDENTIFY)