diff --git a/hooks/cow_device b/hooks/cow_device
new file mode 100755
index 0000000..446ddbb
--- /dev/null
+++ b/hooks/cow_device
@@ -0,0 +1,19 @@
+run_hook ()
+{
+    # Format and run immediately cow_device
+
+    if [[ "${format}" == "y" ]]; then
+        sfdisk -l
+
+        read -p "Welches Laufwerk soll eine cow_device erhalten? /dev/sda : " formatdevice
+        [[ -z "${formatdevice}" ]] && formatdevice=/dev/sda
+
+        sfdisk -a 2048 -n 3:: -c 3:"cow_device" -t 3:8300 ${formatdevice}
+        mkfs.btrfs -f -L cow_device ${formatdevice}3
+
+        launch_interactive_shell
+    fi
+
+}
+
+# vim: set ft=sh ts=4 sw=4 et:
diff --git a/install/cow_device b/install/cow_device
new file mode 100755
index 0000000..1d29ce0
--- /dev/null
+++ b/install/cow_device
@@ -0,0 +1,112 @@
+#!/bin/bash
+
+build()
+{
+    add_all_modules /
+    # syslinux
+    add_binary extlinux
+    #add_file /usr/lib/syslinux/bios/gptmbr.bin
+    #add_file /etc/udev/rules.d/69-save-hdd-live.rules
+    #add_file "/usr/lib/udev/rules.d/10-dm.rules"
+    #add_file "/usr/lib/udev/rules.d/13-dm-disk.rules"
+    #add_file "/usr/lib/udev/rules.d/95-dm-notify.rules"
+    #add_file "/usr/lib/initcpio/udev/11-dm-initramfs.rules" "/usr/lib/udev/rules.d/11-dm-initramfs.rules"
+
+    # util-linux
+    add_binary findmnt
+    add_binary blockdev
+    add_binary fdisk
+    add_binary sfdisk
+    add_binary hexdump
+    add_binary losetup
+    add_binary mkswap
+    add_binary umount
+    add_binary wipefs
+
+    # e2fsprogs
+    add_binary badblocks
+    add_binary chattr
+    add_binary fsck.ext4
+    add_binary lsattr
+    add_binary mkfs.ext4
+    add_binary tune2fs
+
+    # xfsprogs
+    add_binary mkfs.xfs
+    add_binary xfs_repair
+
+    # cryptsetup
+    add_binary cryptsetup
+
+    # device-mapper
+    add_binary dmsetup
+
+    # gptfdisk
+    add_binary gdisk
+
+    # rsync
+    add_binary rsync
+
+    # coreutils
+    add_binary cat
+    add_binary cp
+    add_binary dd
+    add_binary mv
+    add_binary rm
+    add_binary sync
+    add_binary md5sum
+    add_binary sha1sum
+    add_binary date
+
+    # bash
+    add_binary bash
+
+    # findutils
+    add_binary find
+    add_binary xargs
+
+    # procps-ng
+    add_binary free
+    add_binary ps
+    add_binary slabtop
+    add_binary top
+    add_binary vmstat
+
+    # smartmontools
+    add_binary smartctl
+    #add_file /usr/share/smartmontools/drivedb.h
+
+    # hdparm
+    add_binary hdparm
+
+    # ncurses
+    #add_file /usr/share/terminfo/l/linux
+
+    # nano
+    add_binary nano
+
+    # iproute2
+    add_binary ip
+
+    # iw
+    add_binary iw
+
+    # grep
+    add_binary grep
+
+    # blkid
+    add_binary blkid
+
+    # runscript
+    add_runscript
+
+}
+
+help ()
+{
+cat <<HELPEOF
+  Rescue hook!
+HELPEOF
+}
+
+# vim: set ft=sh ts=4 sw=4 et:
diff --git a/make_mksquashfs-auto.sh b/make_mksquashfs-auto.sh
index 5c71b0f..477eac1 100755
--- a/make_mksquashfs-auto.sh
+++ b/make_mksquashfs-auto.sh
@@ -108,6 +108,9 @@ function filesystem() {
 
         cp -v script/archiso* ${work_dir}/${arch}/airootfs/usr/lib/initcpio/
 
+        cp -v install/cow_device ${work_dir}/${arch}/airootfs/usr/lib/initcpio/install/
+        cp -v hooks/cow_device ${work_dir}/${arch}/airootfs/usr/lib/initcpio/hooks/
+
     fi
 
 
@@ -120,6 +123,9 @@ function IMAGE() {
     if [ "$image" != "n" ]
     then
 
+        echo "System wird gereinigt und komprimiert!!!"
+        sleep 5
+
         mkdir -p ${work_dir}/iso/${install_dir}/${arch}/airootfs/
 
         arch-chroot ${work_dir}/${arch}/airootfs /bin/bash <<EOT
@@ -139,9 +145,6 @@ EOT
             echo "airootfs.sfs nicht vorhanden!"
         fi
 
-        echo "System wird Komprimiert!!!"
-        sleep 5
-
         mksquashfs ${work_dir}/${arch}/airootfs ${work_dir}/iso/${install_dir}/${arch}/airootfs.sfs -comp xz -b 262144
 
         sha512sum ${work_dir}/iso/${install_dir}/${arch}/airootfs.sfs > airootfs.sha512