diff --git a/init.sh b/init.sh
index 1e7c46f..c12304b 100755
--- a/init.sh
+++ b/init.sh
@@ -167,7 +167,7 @@ fi
 # unmount if device is mounted
 umount_device (){
 local mounted_part=$(mount | grep "${1}[0-9]" | awk '{print $3}')
-if [ ! -z $mounted_part ]
+if [ !  "$mounted_part" == "" ]
 then
     for part in $mounted_part
     do
@@ -181,13 +181,14 @@ fi
 }
 
 efi_create_key_structure () {
-parted -s $1 mklabel gpt mkpart EFS fat32 1MiB 128MiB set 1 boot on mkpart debian fat32 128MiB 100%
-sleep 2
-mkfs.vfat ${1}1 -n efi &> /dev/null
-mkfs.vfat ${1}2 -n debian &> /dev/null
-mount ${1}2 $2
-create_dir $2/efi
-mount ${1}1 $2/efi
+    parted -s $1 mklabel gpt mkpart EFS fat32 1MiB 128MiB set 1 boot on mkpart debian fat32 128MiB 100%
+    sleep 2
+    mkfs.vfat ${1}1 -n efi &> /dev/null
+    mkfs.vfat ${1}2 -n debian &> /dev/null
+    sync
+    mount ${1}2 $2
+    create_dir $2/efi
+    mount ${1}1 $2/efi
 }
 
 bios_create_key_structure() {