diff --git a/sys/sys/fdcio.h b/sys/sys/fdcio.h
index e3ffc249cb7c..c4d39c2af31e 100644
--- a/sys/sys/fdcio.h
+++ b/sys/sys/fdcio.h
@@ -181,27 +181,17 @@ enum fd_drivetype {
  * XXX: should have been done 20 years ago to make sense.
  */
 #ifdef PC98
-#define FDF_3_1722 21,2,0xFF,0x04,82,0,2,2,0x0C,2,0,FL_MFM
-#define FDF_3_1476 18,2,0xFF,0x1B,82,0,2,2,0x54,1,0,FL_MFM
 #define FDF_3_1440 18,2,0xFF,0x1B,80,0,2,2,0x54,1,0,FL_MFM
 #define FDF_3_1200 15,2,0xFF,0x1B,80,0,0,2,0x54,1,0,FL_MFM
-#define FDF_3_820  10,2,0xFF,0x10,82,0,1,2,0x30,1,0,FL_MFM
-#define FDF_3_800  10,2,0xFF,0x10,80,0,1,2,0x30,1,0,FL_MFM
 #define FDF_3_720   9,2,0xFF,0x20,80,0,1,2,0x50,1,0,FL_MFM
 #define FDF_3_360   9,2,0xFF,0x20,40,0,1,2,0x50,1,0,FL_MFM|FL_2STEP
 #define FDF_3_640   8,2,0xFF,0x2A,80,0,1,2,0x50,1,0,FL_MFM
 #define FDF_3_1230  8,3,0xFF,0x35,77,0,0,2,0x74,1,0,FL_MFM
-#define FDF_3_1280  8,3,0xFF,0x35,80,0,0,2,0x74,1,0,FL_MFM
-#define FDF_3_1480  9,3,0xFF,0x35,82,0,0,2,0x47,1,0,FL_MFM
-#define FDF_3_1640 10,3,0xFF,0x1B,82,0,2,2,0x54,1,0,FL_MFM
 #define FDF_5_1200 15,2,0xFF,0x1B,80,0,0,2,0x54,1,0,FL_MFM
-#define FDF_5_820  10,2,0xFF,0x10,82,0,1,2,0x30,1,0,FL_MFM
-#define FDF_5_800  10,2,0xFF,0x10,80,0,1,2,0x30,1,0,FL_MFM
 #define FDF_5_720   9,2,0xFF,0x20,80,0,1,2,0x50,1,0,FL_MFM
 #define FDF_5_360   9,2,0xFF,0x20,40,0,1,2,0x50,1,0,FL_MFM|FL_2STEP
 #define FDF_5_640   8,2,0xFF,0x2A,80,0,1,2,0x50,1,0,FL_MFM
 #define FDF_5_1230  8,3,0xFF,0x35,77,0,0,2,0x74,1,0,FL_MFM
-#define FDF_5_1280  8,3,0xFF,0x35,80,0,0,2,0x74,1,0,FL_MFM
 #else /* PC98 */
 #define FDF_3_2880 36,2,0xFF,0x1B,80,0,FDC_1MBPS,002,0x4C,1,1,FL_MFM|FL_PERPND
 #define FDF_3_1722 21,2,0xFF,0x04,82,0,FDC_500KBPS,2,0x0C,2,0,FL_MFM
diff --git a/usr.sbin/fdread/fdutil.c b/usr.sbin/fdread/fdutil.c
index c1f4d8f18dfb..c66b0c11bc00 100644
--- a/usr.sbin/fdread/fdutil.c
+++ b/usr.sbin/fdread/fdutil.c
@@ -92,6 +92,7 @@ static struct fd_type fd_types_auto[1] =
 
 
 static struct fd_type fd_types_288m[] = {
+#ifndef PC98
 #if 0
 	{ FDF_3_2880 },
 #endif
@@ -102,30 +103,18 @@ static struct fd_type fd_types_288m[] = {
 	{ FDF_3_820 },
 	{ FDF_3_800 },
 	{ FDF_3_720 },
+#endif	/* !PC98 */
 	{ 0,0,0,0,0,0,0,0,0,0,0,0 }
 };
 
 static struct fd_type fd_types_144m[] = {
 #ifdef PC98
-#if 0
-	{ FDF_3_1722 },
-	{ FDF_3_1476 },
-#endif
 	{ FDF_3_1440 },
 	{ FDF_3_1200 },
-#if 0
-	{ FDF_3_820 },
-	{ FDF_3_800 },
-#endif
 	{ FDF_3_720 },
 	{ FDF_3_360 },
 	{ FDF_3_640 },
 	{ FDF_3_1230 },
-#if 0
-	{ FDF_3_1280 },
-	{ FDF_3_1480 },
-	{ FDF_3_1640 },
-#endif
 	{ 0,0,0,0,0,0,0,0,0,0,0,0 }
 #else
 	{ FDF_3_1722 },
@@ -142,17 +131,10 @@ static struct fd_type fd_types_144m[] = {
 static struct fd_type fd_types_12m[] = {
 #ifdef PC98
 	{ FDF_5_1200 },
-#if 0
-	{ FDF_5_820 },
-	{ FDF_5_800 },
-#endif
 	{ FDF_5_720 },
 	{ FDF_5_360 },
 	{ FDF_5_640 },
 	{ FDF_5_1230 },
-#if 0
-	{ FDF_5_1280 },
-#endif
 	{ 0,0,0,0,0,0,0,0,0,0,0,0 }
 #else
 	{ FDF_5_1200 },
@@ -170,13 +152,17 @@ static struct fd_type fd_types_12m[] = {
 
 static struct fd_type fd_types_720k[] =
 {
+#ifndef PC98
 	{ FDF_3_720 },
+#endif
 	{ 0,0,0,0,0,0,0,0,0,0,0,0 }
 };
 
 static struct fd_type fd_types_360k[] =
 {
+#ifndef PC98
 	{ FDF_5_360 },
+#endif
 	{ 0,0,0,0,0,0,0,0,0,0,0,0 }
 };