diff --git a/bash/rescue-ovh.sh b/bash/rescue-ovh.sh
index 1ef38a2..5dee19b 100644
--- a/bash/rescue-ovh.sh
+++ b/bash/rescue-ovh.sh
@@ -16,7 +16,7 @@ rescue_wipe_0_init_ovh_vle2() {
 	#
 	parted "${device}" \
 		unit "${unit}" \
-		mkpart "crypt" 4610 40960
+		mkpart "crypt" 4610 40959
 	#
 	parted "${device}" \
 		unit "${unit}" \
@@ -81,6 +81,7 @@ rescue_wipe_0_init_ovh_vle2() {
 }
 
 rescue_wipe_2_make_ovh_vle2() {
+	local device="/dev/sdb"
 	local passphrase
 	# crypt / close
 	cryptsetup luksClose "crypt"
diff --git a/bash/rescue.sh b/bash/rescue.sh
index b466b92..732d1ea 100644
--- a/bash/rescue.sh
+++ b/bash/rescue.sh
@@ -140,7 +140,7 @@ source \"/etc/bash/main.sh\" ; rescue_configure \"${hostname}\""
 
 rescue_wipe_1_zero() {
 	dd status="progress" \
-		if="/dev/zero" of="/dev/mapper/crypt" bs="1G"
+		if="/dev/zero" of="/dev/mapper/crypt" bs="512M"
 }
 
 rescue_wipe_3_close() {