diff --git a/sys/dev/twe/twe.c b/sys/dev/twe/twe.c
index 90dfa2e505e4..6994cb4106d1 100644
--- a/sys/dev/twe/twe.c
+++ b/sys/dev/twe/twe.c
@@ -201,7 +201,7 @@ twe_add_unit(struct twe_softc *sc, int unit)
     int				table, error = 0;
     u_int16_t			dsize;
     TWE_Param			*drives = NULL, *param = NULL;
-    TWE_Unit_Descriptor		*ud;
+    TWE_Array_Descriptor	*ud;
 
     if (unit < 0 || unit > TWE_MAX_UNITS)
 	return (EINVAL);
@@ -244,8 +244,9 @@ twe_add_unit(struct twe_softc *sc, int unit)
 	error = EIO;
 	goto out;
     }
-    ud = (TWE_Unit_Descriptor *)param->data;
+    ud = (TWE_Array_Descriptor *)param->data;
     dr->td_type = ud->configuration;
+    dr->td_stripe = ud->stripe_size;
 
     /* build synthetic geometry as per controller internal rules */
     if (dr->td_size > 0x200000) {
diff --git a/sys/dev/twe/twe_freebsd.c b/sys/dev/twe/twe_freebsd.c
index 9ad65c94d9e2..0328599c1293 100644
--- a/sys/dev/twe/twe_freebsd.c
+++ b/sys/dev/twe/twe_freebsd.c
@@ -818,6 +818,13 @@ twed_attach(device_t dev)
     sc->twed_disk->d_maxsize = (TWE_MAX_SGL_LENGTH - 1) * PAGE_SIZE;
     sc->twed_disk->d_sectorsize = TWE_BLOCK_SIZE;
     sc->twed_disk->d_mediasize = TWE_BLOCK_SIZE * (off_t)sc->twed_drive->td_size;
+    if (sc->twed_drive->td_type == TWE_UD_CONFIG_RAID0 ||
+	sc->twed_drive->td_type == TWE_UD_CONFIG_RAID5 ||
+	sc->twed_drive->td_type == TWE_UD_CONFIG_RAID10) {
+	    sc->twed_disk->d_stripesize =
+		TWE_BLOCK_SIZE << sc->twed_drive->td_stripe;
+	    sc->twed_disk->d_stripeoffset = 0;
+    }
     sc->twed_disk->d_fwsectors = sc->twed_drive->td_sectors;
     sc->twed_disk->d_fwheads = sc->twed_drive->td_heads;
     sc->twed_disk->d_unit = sc->twed_drive->td_sys_unit;
diff --git a/sys/dev/twe/twevar.h b/sys/dev/twe/twevar.h
index 2711ccc94932..4990ca80666d 100644
--- a/sys/dev/twe/twevar.h
+++ b/sys/dev/twe/twevar.h
@@ -59,6 +59,7 @@ struct twe_drive
     /* unit state and type */
     u_int8_t		td_state;
     u_int8_t		td_type;
+    u_int8_t		td_stripe;
 
     /* handle for attached driver */
     device_t		td_disk;