diff --git a/dotfiles/preparing_image.md b/dotfiles/preparing_image.md
index 2ce7a1b..2c7b1f4 100644
--- a/dotfiles/preparing_image.md
+++ b/dotfiles/preparing_image.md
@@ -43,3 +43,17 @@ then `sudo apt update` and `sudo apt upgrade` , sudo reboot
 (im not sure exactly what each part does and if it works but is suppose to stop screensaver / hide cursor / remove on screen power warnings etc)
 
 - i then went into pi item -> Preferences and set a black background , small task bar , no screensaver  and went into the file explorer -> Edit -> Preferences -> Volume Managment -> unchecked 'show available options for removable media ...' 
+
+## flashing
+
+i am trying to flash the device using the unix command `dd` on a raspberry pi.
+
+- i want my image to not contain empty space so it can fit on smaller sd cards (4gigs)
+
+- first check how much space is needed and name of device : `df -h`
+
+- do i need to mount the device : ??
+
+- `dd if=/dev/mmcblk0 of=~/r_e_c_u_r-image.img bs=1M count=3000 iflag=fullblock`
+
+