diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
index 07ef88bd109b..7a88de9ada29 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -41,6 +41,10 @@
 #include <asm/io.h>
 #include <asm/div64.h>
 
+#define IDE_DISK_PARTS		(1 << PARTN_BITS)
+#define IDE_DISK_MINORS		IDE_DISK_PARTS
+#define IDE_DISK_EXT_MINORS	(IDE_DISK_PARTS - IDE_DISK_MINORS)
+
 struct ide_disk_obj {
 	ide_drive_t	*drive;
 	ide_driver_t	*driver;
@@ -1151,8 +1155,8 @@ static int ide_disk_probe(ide_drive_t *drive)
 	if (!idkp)
 		goto failed;
 
-	g = alloc_disk_node(1 << PARTN_BITS,
-			hwif_to_node(drive->hwif));
+	g = alloc_disk_ext_node(IDE_DISK_MINORS, IDE_DISK_EXT_MINORS,
+				hwif_to_node(drive->hwif));
 	if (!g)
 		goto out_free_idkp;
 
@@ -1178,7 +1182,8 @@ static int ide_disk_probe(ide_drive_t *drive)
 	} else
 		drive->attach = 1;
 
-	g->minors = 1 << PARTN_BITS;
+	g->minors = IDE_DISK_MINORS;
+	g->ext_minors = IDE_DISK_EXT_MINORS;
 	g->driverfs_dev = &drive->gendev;
 	g->flags = drive->removable ? GENHD_FL_REMOVABLE : 0;
 	set_capacity(g, idedisk_capacity(drive));
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index e5e7d7856454..d1bb0e1d2d28 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -86,6 +86,10 @@ MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
 
+#define SD_PARTS	64
+#define SD_MINORS	16
+#define SD_EXT_MINORS	(SD_PARTS - SD_MINORS)
+
 static int  sd_revalidate_disk(struct gendisk *);
 static int  sd_probe(struct device *);
 static int  sd_remove(struct device *);
@@ -1801,7 +1805,7 @@ static int sd_probe(struct device *dev)
 	if (!sdkp)
 		goto out;
 
-	gd = alloc_disk(16);
+	gd = alloc_disk_ext(SD_MINORS, SD_EXT_MINORS);
 	if (!gd)
 		goto out_free;
 
@@ -1845,7 +1849,8 @@ static int sd_probe(struct device *dev)
 
 	gd->major = sd_major((index & 0xf0) >> 4);
 	gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
-	gd->minors = 16;
+	gd->minors = SD_MINORS;
+	gd->ext_minors = SD_EXT_MINORS;
 	gd->fops = &sd_fops;
 
 	if (index < 26) {