diff --git a/sbin/fdisk/fdisk.8 b/sbin/fdisk/fdisk.8
index a43a85a16f87..70b0f8c5e0e7 100644
--- a/sbin/fdisk/fdisk.8
+++ b/sbin/fdisk/fdisk.8
@@ -9,7 +9,7 @@
 .Op Fl i
 .Op Fl u
 .Op Fl a
-.Op Fl 0123
+.Op Fl 1234
 .Op Ar disk
 .Bl -tag -width time
 .Nm fdisk
@@ -66,7 +66,7 @@ is given.
 Change the active partition only.  Ignored if
 .Fl f
 is given.
-.It Fl 0123
+.It Fl 1234
 Operate on a single fdisk entry only.  Ignored if
 .Fl f
 is given.
@@ -133,19 +133,19 @@ An example follows:
 		
 	Warning: BIOS sector numbering starts with sector 1
 	Information from DOS bootblock is:
-	The data for partition 0 is:
+	The data for partition 1 is:
 	sysid 165,(FreeBSD/NetBSD/386BSD)
     	    start 495, size 380160 (185 Meg), flag 0
 		beg: cyl 1/ sector 1/ head 0;
 		end: cyl 768/ sector 33/ head 14
-	The data for partition 1 is:
+	The data for partition 2 is:
 	sysid 164,(unknown)
     	    start 378180, size 2475 (1 Meg), flag 0
 		beg: cyl 764/ sector 1/ head 0;
 		end: cyl 768/ sector 33/ head 14
-	The data for partition 2 is:
-	<UNUSED>
 	The data for partition 3 is:
+	<UNUSED>
+	The data for partition 4 is:
 	sysid 99,(ISC UNIX, other System V/386, GNU HURD or Mach)
     	    start 380656, size 224234 (109 Meg), flag 80
 		beg: cyl 769/ sector 2/ head 0;
@@ -330,7 +330,7 @@ Example (all of these are equivalent), for a disk with 1019 cylinders,
 .Xc
 Set the partition given by
 .Ar partition
-(0-3) to type
+(1-4) to type
 .Ar type ,
 starting at sector
 .Ar start
@@ -363,18 +363,18 @@ Note: the start offset will be rounded upwards to a head boundary if
 necessary, and the end offset will be rounded downwards to a cylinder
 boundary if necessary.
 .Pp
-Example: to clear partition 3 and mark it as unused:
+Example: to clear partition 4 and mark it as unused:
 .Pp
 .nf
-        p       3       0       0       0
+        p       4       0       0       0
 .fi
 .Pp
-Example: to set partition 0 to a FreeBSD partition, starting at sector 1
+Example: to set partition 1 to a FreeBSD partition, starting at sector 1
 for 2503871 sectors (note: these numbers will be rounded upwards and
 downwards to correspond to head and cylinder boundaries):
 .Pp
 .nf
-        p       0       165     1       2503871
+        p       1       165     1       2503871
 .fi
 .It Xo
 .Ic a
@@ -385,10 +385,10 @@ Make
 the active partition.  Can occur anywhere in the config file, but only
 one must be present.
 .Pp
-Example: to make partition 0 the active partition:
+Example: to make partition 1 the active partition:
 .Pp
 .nf
-        a       0
+        a       1
 .fi
 
 .El
diff --git a/sbin/fdisk/fdisk.c b/sbin/fdisk/fdisk.c
index 8e3e2674a8b3..7a4c819c119e 100644
--- a/sbin/fdisk/fdisk.c
+++ b/sbin/fdisk/fdisk.c
@@ -246,9 +246,6 @@ main(int argc, char *argv[])
 		else { register int flag;
 			for ( ; (flag = *token++) ; ) {
 				switch (flag) {
-				case '0':
-					partition = 0;
-					break;
 				case '1':
 					partition = 1;
 					break;
@@ -258,6 +255,9 @@ main(int argc, char *argv[])
 				case '3':
 					partition = 3;
 					break;
+				case '4':
+					partition = 4;
+					break;
 				case 'a':
 					a_flag = 1;
 					break;
@@ -376,7 +376,7 @@ main(int argc, char *argv[])
 	    printf("Warning: BIOS sector numbering starts with sector 1\n");
 	    printf("Information from DOS bootblock is:\n");
 	    if (partition == -1)
-		for (i = 0; i < NDOSPART; i++)
+		for (i = 1; i <= NDOSPART; i++)
 		    change_part(i);
 	    else
 		change_part(partition);
@@ -406,7 +406,7 @@ main(int argc, char *argv[])
 	exit(0);
 
 usage:
-	printf("fdisk {-a|-i|-u} [-f <config file> [-t] [-v]] [-{0,1,2,3}] [disk]\n");
+	printf("fdisk {-a|-i|-u} [-f <config file> [-t] [-v]] [-{1,2,3,4}] [disk]\n");
 	return(1);
 }
 
@@ -418,7 +418,7 @@ int	i;
 	print_params();
 	printf("Information from DOS bootblock is:\n");
 	if (which == -1)
-		for (i = 0; i < NDOSPART; i++)
+		for (i = 1; i <= NDOSPART; i++)
 			printf("%d: ", i), print_part(i);
 	else
 		print_part(which);
@@ -432,7 +432,7 @@ print_part(int i)
 	struct	  dos_partition *partp;
 	u_int64_t part_mb;
 
-	partp = ((struct dos_partition *) &mboot.parts) + i;
+	partp = ((struct dos_partition *) &mboot.parts) + i - 1;
 
 	if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) {
 		printf("<UNUSED>\n");
@@ -490,7 +490,7 @@ unsigned long size = disksecs - start;
 static void
 change_part(int i)
 {
-struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i;
+struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i - 1;
 
     printf("The data for partition %d is:\n", i);
     print_part(i);
@@ -500,9 +500,9 @@ struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i;
 
 	if (i_flag) {
 		bzero((char *)partp, sizeof (struct dos_partition));
-		if (i == 3) {
+		if (i == 4) {
 			init_sector0(1);
-			printf("\nThe static data for the DOS partition 3 has been reinitialized to:\n");
+			printf("\nThe static data for the DOS partition 4 has been reinitialized to:\n");
 			print_part(i);
 		}
 	}
@@ -563,7 +563,7 @@ static void
 change_active(int which)
 {
 int i;
-int active = 3, tmp;
+int active = 4, tmp;
 struct dos_partition *partp = ((struct dos_partition *) &mboot.parts);
 
 	if (a_flag && which != -1)
@@ -575,8 +575,8 @@ struct dos_partition *partp = ((struct dos_partition *) &mboot.parts);
 	while (!ok("Are you happy with this choice"));
 	for (i = 0; i < NDOSPART; i++)
 		partp[i].dp_flag = 0;
-	if (active >= 0 && active < NDOSPART)
-		partp[active].dp_flag = ACTIVE;
+	if (active > 0 && active <= NDOSPART)
+		partp[active-1].dp_flag = ACTIVE;
 }
 
 void
@@ -1087,13 +1087,13 @@ process_partition(command)
 	    break;
 	}
 	partition = command->args[0].arg_val;
-	if (partition < 0 || partition > 3)
+	if (partition < 1 || partition > 4)
 	{
 	    fprintf(stderr, "%s: ERROR line %d: invalid partition number %d\n",
 		    name, current_line_number, partition);
 	    break;
 	}
-	partp = ((struct dos_partition *) &mboot.parts) + partition;
+	partp = ((struct dos_partition *) &mboot.parts) + partition - 1;
 	bzero((char *)partp, sizeof (struct dos_partition));
 	partp->dp_typ = command->args[1].arg_val;
 	partp->dp_start = command->args[2].arg_val;
@@ -1198,7 +1198,7 @@ process_active(command)
 	    break;
 	}
 	partition = command->args[0].arg_val;
-	if (partition < 0 || partition > 3)
+	if (partition < 1 || partition > 4)
 	{
 	    fprintf(stderr, "%s: ERROR line %d: invalid partition number %d\n",
 		    name, current_line_number, partition);
@@ -1210,7 +1210,7 @@ process_active(command)
 	partp = ((struct dos_partition *) &mboot.parts);
 	for (i = 0; i < NDOSPART; i++)
 	    partp[i].dp_flag = 0;
-	partp[partition].dp_flag = ACTIVE;
+	partp[partition-1].dp_flag = ACTIVE;
 
 	status = 1;
 	break;
diff --git a/sbin/i386/fdisk/fdisk.8 b/sbin/i386/fdisk/fdisk.8
index a43a85a16f87..70b0f8c5e0e7 100644
--- a/sbin/i386/fdisk/fdisk.8
+++ b/sbin/i386/fdisk/fdisk.8
@@ -9,7 +9,7 @@
 .Op Fl i
 .Op Fl u
 .Op Fl a
-.Op Fl 0123
+.Op Fl 1234
 .Op Ar disk
 .Bl -tag -width time
 .Nm fdisk
@@ -66,7 +66,7 @@ is given.
 Change the active partition only.  Ignored if
 .Fl f
 is given.
-.It Fl 0123
+.It Fl 1234
 Operate on a single fdisk entry only.  Ignored if
 .Fl f
 is given.
@@ -133,19 +133,19 @@ An example follows:
 		
 	Warning: BIOS sector numbering starts with sector 1
 	Information from DOS bootblock is:
-	The data for partition 0 is:
+	The data for partition 1 is:
 	sysid 165,(FreeBSD/NetBSD/386BSD)
     	    start 495, size 380160 (185 Meg), flag 0
 		beg: cyl 1/ sector 1/ head 0;
 		end: cyl 768/ sector 33/ head 14
-	The data for partition 1 is:
+	The data for partition 2 is:
 	sysid 164,(unknown)
     	    start 378180, size 2475 (1 Meg), flag 0
 		beg: cyl 764/ sector 1/ head 0;
 		end: cyl 768/ sector 33/ head 14
-	The data for partition 2 is:
-	<UNUSED>
 	The data for partition 3 is:
+	<UNUSED>
+	The data for partition 4 is:
 	sysid 99,(ISC UNIX, other System V/386, GNU HURD or Mach)
     	    start 380656, size 224234 (109 Meg), flag 80
 		beg: cyl 769/ sector 2/ head 0;
@@ -330,7 +330,7 @@ Example (all of these are equivalent), for a disk with 1019 cylinders,
 .Xc
 Set the partition given by
 .Ar partition
-(0-3) to type
+(1-4) to type
 .Ar type ,
 starting at sector
 .Ar start
@@ -363,18 +363,18 @@ Note: the start offset will be rounded upwards to a head boundary if
 necessary, and the end offset will be rounded downwards to a cylinder
 boundary if necessary.
 .Pp
-Example: to clear partition 3 and mark it as unused:
+Example: to clear partition 4 and mark it as unused:
 .Pp
 .nf
-        p       3       0       0       0
+        p       4       0       0       0
 .fi
 .Pp
-Example: to set partition 0 to a FreeBSD partition, starting at sector 1
+Example: to set partition 1 to a FreeBSD partition, starting at sector 1
 for 2503871 sectors (note: these numbers will be rounded upwards and
 downwards to correspond to head and cylinder boundaries):
 .Pp
 .nf
-        p       0       165     1       2503871
+        p       1       165     1       2503871
 .fi
 .It Xo
 .Ic a
@@ -385,10 +385,10 @@ Make
 the active partition.  Can occur anywhere in the config file, but only
 one must be present.
 .Pp
-Example: to make partition 0 the active partition:
+Example: to make partition 1 the active partition:
 .Pp
 .nf
-        a       0
+        a       1
 .fi
 
 .El
diff --git a/sbin/i386/fdisk/fdisk.c b/sbin/i386/fdisk/fdisk.c
index 8e3e2674a8b3..7a4c819c119e 100644
--- a/sbin/i386/fdisk/fdisk.c
+++ b/sbin/i386/fdisk/fdisk.c
@@ -246,9 +246,6 @@ main(int argc, char *argv[])
 		else { register int flag;
 			for ( ; (flag = *token++) ; ) {
 				switch (flag) {
-				case '0':
-					partition = 0;
-					break;
 				case '1':
 					partition = 1;
 					break;
@@ -258,6 +255,9 @@ main(int argc, char *argv[])
 				case '3':
 					partition = 3;
 					break;
+				case '4':
+					partition = 4;
+					break;
 				case 'a':
 					a_flag = 1;
 					break;
@@ -376,7 +376,7 @@ main(int argc, char *argv[])
 	    printf("Warning: BIOS sector numbering starts with sector 1\n");
 	    printf("Information from DOS bootblock is:\n");
 	    if (partition == -1)
-		for (i = 0; i < NDOSPART; i++)
+		for (i = 1; i <= NDOSPART; i++)
 		    change_part(i);
 	    else
 		change_part(partition);
@@ -406,7 +406,7 @@ main(int argc, char *argv[])
 	exit(0);
 
 usage:
-	printf("fdisk {-a|-i|-u} [-f <config file> [-t] [-v]] [-{0,1,2,3}] [disk]\n");
+	printf("fdisk {-a|-i|-u} [-f <config file> [-t] [-v]] [-{1,2,3,4}] [disk]\n");
 	return(1);
 }
 
@@ -418,7 +418,7 @@ int	i;
 	print_params();
 	printf("Information from DOS bootblock is:\n");
 	if (which == -1)
-		for (i = 0; i < NDOSPART; i++)
+		for (i = 1; i <= NDOSPART; i++)
 			printf("%d: ", i), print_part(i);
 	else
 		print_part(which);
@@ -432,7 +432,7 @@ print_part(int i)
 	struct	  dos_partition *partp;
 	u_int64_t part_mb;
 
-	partp = ((struct dos_partition *) &mboot.parts) + i;
+	partp = ((struct dos_partition *) &mboot.parts) + i - 1;
 
 	if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) {
 		printf("<UNUSED>\n");
@@ -490,7 +490,7 @@ unsigned long size = disksecs - start;
 static void
 change_part(int i)
 {
-struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i;
+struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i - 1;
 
     printf("The data for partition %d is:\n", i);
     print_part(i);
@@ -500,9 +500,9 @@ struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i;
 
 	if (i_flag) {
 		bzero((char *)partp, sizeof (struct dos_partition));
-		if (i == 3) {
+		if (i == 4) {
 			init_sector0(1);
-			printf("\nThe static data for the DOS partition 3 has been reinitialized to:\n");
+			printf("\nThe static data for the DOS partition 4 has been reinitialized to:\n");
 			print_part(i);
 		}
 	}
@@ -563,7 +563,7 @@ static void
 change_active(int which)
 {
 int i;
-int active = 3, tmp;
+int active = 4, tmp;
 struct dos_partition *partp = ((struct dos_partition *) &mboot.parts);
 
 	if (a_flag && which != -1)
@@ -575,8 +575,8 @@ struct dos_partition *partp = ((struct dos_partition *) &mboot.parts);
 	while (!ok("Are you happy with this choice"));
 	for (i = 0; i < NDOSPART; i++)
 		partp[i].dp_flag = 0;
-	if (active >= 0 && active < NDOSPART)
-		partp[active].dp_flag = ACTIVE;
+	if (active > 0 && active <= NDOSPART)
+		partp[active-1].dp_flag = ACTIVE;
 }
 
 void
@@ -1087,13 +1087,13 @@ process_partition(command)
 	    break;
 	}
 	partition = command->args[0].arg_val;
-	if (partition < 0 || partition > 3)
+	if (partition < 1 || partition > 4)
 	{
 	    fprintf(stderr, "%s: ERROR line %d: invalid partition number %d\n",
 		    name, current_line_number, partition);
 	    break;
 	}
-	partp = ((struct dos_partition *) &mboot.parts) + partition;
+	partp = ((struct dos_partition *) &mboot.parts) + partition - 1;
 	bzero((char *)partp, sizeof (struct dos_partition));
 	partp->dp_typ = command->args[1].arg_val;
 	partp->dp_start = command->args[2].arg_val;
@@ -1198,7 +1198,7 @@ process_active(command)
 	    break;
 	}
 	partition = command->args[0].arg_val;
-	if (partition < 0 || partition > 3)
+	if (partition < 1 || partition > 4)
 	{
 	    fprintf(stderr, "%s: ERROR line %d: invalid partition number %d\n",
 		    name, current_line_number, partition);
@@ -1210,7 +1210,7 @@ process_active(command)
 	partp = ((struct dos_partition *) &mboot.parts);
 	for (i = 0; i < NDOSPART; i++)
 	    partp[i].dp_flag = 0;
-	partp[partition].dp_flag = ACTIVE;
+	partp[partition-1].dp_flag = ACTIVE;
 
 	status = 1;
 	break;