diff --git a/chr.sh b/chr.sh
index ee23e87..5f3248c 100644
--- a/chr.sh
+++ b/chr.sh
@@ -1,25 +1,30 @@
 
+DEV=/dev/sda
 sgdisk --clear --set-alignment=2 \
     --new=1::+32M --typecode=1:8300 --change-name=1:"RouterOS Boot" --attributes=1:set:2 \
     --new=2::-0 --typecode=2:8300 --change-name=2:"RouterOS" \
     --gpttombr=1:2 \
-    /dev/sda
+    $DEV
 
-dd if=/dev/sda of=pt.bin bs=1 count=66 skip=446
+dd if=$DEV of=pt.bin bs=1 count=66 skip=446
 echo -e "\x80" | dd of=pt.bin  bs=1 count=1  conv=notrunc
 sgdisk --mbrtogpt --clear --set-alignment=2 \
     --new=1::+32M --typecode=1:8300 --change-name=1:"RouterOS Boot" --attributes=1:set:2 \
     --new=2::-0 --typecode=2:8300 --change-name=2:"RouterOS" \
-    /dev/sda
-dd if=mbr.bin of=/dev/sda  bs=1 count=446 conv=notrunc
-dd if=pt.bin of=/dev/sda  bs=1 count=66 seek=446 conv=notrunc
-
+    $DEV
+dd if=mbr.bin of=$DEV  bs=1 count=446 conv=notrunc
+dd if=pt.bin of=$DEV  bs=1 count=66 seek=446 conv=notrunc
+mkfs.vfat -n "Boot" $DEV1
+mkfs.ext4 -F -L "RouterOS"  -m 0 $DEV2
 sudo mkdir -p /tmp/{boot,routeros}
-mount -o loop,rw /dev/sda1  /tmp/boot
+
+mount -o loop,rw $DEV1  /tmp/boot
 mkdir -p  /tmp/boot/{BOOT,EFI/BOOT}
 wget -O /tmp/boot/EFI/BOOT/BOOTX64.EFI https://github.com/elseif/MikroTikPatch/releases/download/7.15.2/BOOTX64.EFI
+umount /tmp/boot
 
-mount -o loop,rw /dev/sda2  /tmp/routeros
+mount -o loop,rw $DEV2  /tmp/routeros
 sudo mkdir -p /tmp/routeros/{var/pdb/{system,option},boot,rw}
 wget -O /tmp/routeros/var/pdb/option/image https://github.com/elseif/MikroTikPatch/releases/download/7.15.2/option-7.15.2.npk
-wget -O /tmp/routeros/var/pdb/system/image https://github.com/elseif/MikroTikPatch/releases/download/7.15.2/routeros-7.15.2.npk
\ No newline at end of file
+wget -O /tmp/routeros/var/pdb/system/image https://github.com/elseif/MikroTikPatch/releases/download/7.15.2/routeros-7.15.2.npk
+umount /tmp/routeros
\ No newline at end of file