diff --git a/drivers/block/swim.c b/drivers/block/swim.c
index 3b3e5b134e2a..2ab70494ace4 100644
--- a/drivers/block/swim.c
+++ b/drivers/block/swim.c
@@ -110,7 +110,7 @@ struct iwm {
 /* Select values for swim_select and swim_readbit */
 
 #define READ_DATA_0	0x074
-#define TWOMEG_DRIVE	0x075
+#define ONEMEG_DRIVE	0x075
 #define SINGLE_SIDED	0x076
 #define DRIVE_PRESENT	0x077
 #define DISK_IN		0x170
@@ -118,9 +118,9 @@ struct iwm {
 #define TRACK_ZERO	0x172
 #define TACHO		0x173
 #define READ_DATA_1	0x174
-#define MFM_MODE	0x175
+#define GCR_MODE	0x175
 #define SEEK_COMPLETE	0x176
-#define ONEMEG_MEDIA	0x177
+#define TWOMEG_MEDIA	0x177
 
 /* Bits in handshake register */
 
@@ -612,7 +612,7 @@ static void setup_medium(struct floppy_state *fs)
 		struct floppy_struct *g;
 		fs->disk_in = 1;
 		fs->write_protected = swim_readbit(base, WRITE_PROT);
-		fs->type = swim_readbit(base, ONEMEG_MEDIA);
+		fs->type = swim_readbit(base, TWOMEG_MEDIA);
 
 		if (swim_track00(base))
 			printk(KERN_ERR
diff --git a/drivers/block/swim3.c b/drivers/block/swim3.c
index 9f931f8f6b4c..0d7527c6825a 100644
--- a/drivers/block/swim3.c
+++ b/drivers/block/swim3.c
@@ -148,7 +148,7 @@ struct swim3 {
 #define MOTOR_ON	2
 #define RELAX		3	/* also eject in progress */
 #define READ_DATA_0	4
-#define TWOMEG_DRIVE	5
+#define ONEMEG_DRIVE	5
 #define SINGLE_SIDED	6	/* drive or diskette is 4MB type? */
 #define DRIVE_PRESENT	7
 #define DISK_IN		8
@@ -156,9 +156,9 @@ struct swim3 {
 #define TRACK_ZERO	10
 #define TACHO		11
 #define READ_DATA_1	12
-#define MFM_MODE	13
+#define GCR_MODE	13
 #define SEEK_COMPLETE	14
-#define ONEMEG_MEDIA	15
+#define TWOMEG_MEDIA	15
 
 /* Definitions of values used in writing and formatting */
 #define DATA_ESCAPE	0x99