diff --git a/bash/hetzner-rescue.sh b/bash/hetzner-rescue.sh
index 22ac7c2..bd15e93 100644
--- a/bash/hetzner-rescue.sh
+++ b/bash/hetzner-rescue.sh
@@ -186,7 +186,11 @@ function hetzner-rescue-wipe-8-8-0 {
         # format esp
         dd \
         if='/dev/zero' of="${device}3" bs='1M'
-        mkfs.vfat -F 32 -n "esp-${number}" "${device}3"
+        mkfs.vfat \
+        -F 32 \
+        -S 4096 \
+        -n "esp-${number}" \
+        "${device}3"
     done
     #
     number=0
@@ -195,20 +199,17 @@ function hetzner-rescue-wipe-8-8-0 {
         echo ; echo "#${number}: ${device}2"
         # wipe boot
         dd status='progress' \
-        if='/dev/zero' of="${device}2" bs='1G'
+        if='/dev/zero' of="${device}2" bs='1G' count=1
     done
     #
     members=()
     for device in "${devices[@]}" ; do
         members+=("${device}2")
     done
-    mdadm \
-    --create '/dev/md/boot' \
-    --name 'boot' \
-    --uuid '6234a0eb:29a3a847:1dbd5ec4:bada5579' \
-    --metadata 1 \
-    --level 0 \
-    --raid-devices ${#devices[@]} \
+    mkfs.btrfs --force \
+    --label 'boot' \
+    --checksum 'sha256' \
+    --data 'raid0' \
     "${members[@]}"
     #
     number=0
@@ -232,12 +233,6 @@ function hetzner-rescue-wipe-8-8-0 {
     --level 0 \
     --raid-devices ${#devices[@]} \
     "${members[@]}"
-    # format boot
-    mkfs.ext4 \
-    -F \
-    -L 'boot' \
-    -U '6234a0eb-29a3-a847-1dbd-5ec4bada5579' \
-    '/dev/md/boot'
     # encrypt
     echo "${passphrase}" \
     | cryptsetup \