diff --git a/README.md b/README.md
index 39451f5..10480ea 100644
--- a/README.md
+++ b/README.md
@@ -1,35 +1,49 @@
 
-https://blog.danman.eu/new-version-of-lenkeng-hdmi-over-ip-extender-lkv373a/
 
-https://github.com/gkralik/python-gst-tutorial
-https://github.com/brettviren/pygst-tutorial-org
 
+## Parts
+ * Mini-HDMI <-> HDMI Adapter
+ * Mini-USB  <-> USB A Cable
+ * Micro-SD-Card >= 2GB
+ * Raspberry Pi Zero or Zero W or Model A (Model B/2B/3 not supported!)
 
-gst-launch-1.0 -v udpsrc multicast-iface="eth0" multicast-group=239.255.42.42 auto-multicast=true port=5004 caps="video/mpegts, media=(string)video" ! tsdemux ! decodebin ! videoconvert ! autovideosink sync=false
+## Hardware
+     ______________________
+    | :::::::::::::::::::: |
+    |                      |
+    |_HDMI________USB__PWR_|
+       |           |   nc
+       v           v
+     Beamer        PC
 
-vlc -vvv udp://@239.255.42.42:5004
+## Build windows snapshot-tool
 
+cd windows-snapshot-tool
+mkdir build && cd build
+cmake -DCMAKE_TOOLCHAIN_FILE=../Toolchain-cross-mingw32-linux.cmake ../
+make
 
-raspi: ! omxh264dec ! autovideosink
-fbdevsink device=/dev/fb0
-h264parse ! omxh264dec ! glimagesink
-gst-launch-1.0 videotestsrc ! eglglessink
-
-g_mass_storage
-stall=0 ro=1
 
+## prepare raspberry pi
 
+install raspbian lite
 
-(gstreamer-1.0) python3-gi (or python3-gst-1.0 ??) gstreamer1.0-omx gstreamer1.0-plugins-good gstreamer1.0-plugins-bad
+sudo raspi-config
+  * ??
+  * ??
 
+sudo su -
+apt update
+apt dist-upgrade
+apt install python3-pyinotify python3-rpi.gpio 
 
-length: 1324 (packet: 1358)
-pid: 0x7d1    cc=0 1 2 12 13 14 15
+echo "dtoverlay=dwc2" >> /boot/config.txt
 
 
+readonly-root
 
-how to build:
 
-mkdir build && cd build
-cmake -DCMAKE_TOOLCHAIN_FILE=../Toolchain-cross-mingw32-linux.cmake ../
-make
+## ToDo
+ * readonly-root
+ * dritte led für boot?
+ * screenshot-tool option für sofortigen screenshot
diff --git a/doc/README.md b/doc/README.md
new file mode 100644
index 0000000..39451f5
--- /dev/null
+++ b/doc/README.md
@@ -0,0 +1,35 @@
+
+https://blog.danman.eu/new-version-of-lenkeng-hdmi-over-ip-extender-lkv373a/
+
+https://github.com/gkralik/python-gst-tutorial
+https://github.com/brettviren/pygst-tutorial-org
+
+
+gst-launch-1.0 -v udpsrc multicast-iface="eth0" multicast-group=239.255.42.42 auto-multicast=true port=5004 caps="video/mpegts, media=(string)video" ! tsdemux ! decodebin ! videoconvert ! autovideosink sync=false
+
+vlc -vvv udp://@239.255.42.42:5004
+
+
+raspi: ! omxh264dec ! autovideosink
+fbdevsink device=/dev/fb0
+h264parse ! omxh264dec ! glimagesink
+gst-launch-1.0 videotestsrc ! eglglessink
+
+g_mass_storage
+stall=0 ro=1
+
+
+
+(gstreamer-1.0) python3-gi (or python3-gst-1.0 ??) gstreamer1.0-omx gstreamer1.0-plugins-good gstreamer1.0-plugins-bad
+
+
+length: 1324 (packet: 1358)
+pid: 0x7d1    cc=0 1 2 12 13 14 15
+
+
+
+how to build:
+
+mkdir build && cd build
+cmake -DCMAKE_TOOLCHAIN_FILE=../Toolchain-cross-mingw32-linux.cmake ../
+make
diff --git a/raspberry-environment/cmd.txt b/raspberry-environment/cmd.txt
index 286cb4e..6431548 100644
--- a/raspberry-environment/cmd.txt
+++ b/raspberry-environment/cmd.txt
@@ -119,11 +119,11 @@ done
 
 
 ToDo:
-
-inotify only once!!
 recreate image on boot
 
+repartition for usbimage?
+memory split? (hdmi ausgabe u framebuffer beachten!)
 readonly-root
+dritte led für boot?
 
-
-python3-pyinotify
+screenshot-tool option für sofortigen screenshot
diff --git a/raspberry-environment/pythonscript.py b/raspberry-environment/pythonscript.py
index 899b58f..2bb16db 100644
--- a/raspberry-environment/pythonscript.py
+++ b/raspberry-environment/pythonscript.py
@@ -120,7 +120,18 @@ if __name__ == '__main__':
   GPIO.output(23, GPIO.LOW)
 
   try:
-    subprocess.run(['modprobe', 'g_mass_storage', 'file=/usbdisk.img', 'stall=0', 'removable=1', 'iSerialNumber=1234567890'], shell=False, check=True)
+    subprocess.run(['dd', 'if=/dev/zero', 'of=/tmp/usbdisk.img', 'bs=1M', 'count=96'], shell=False, check=True)
+    #sfdisk
+    #loop-mount
+    #mkfs
+    subprocess.run(['mkfs', '-t', 'vfat', '-n', 'SCREENSHOTS', '/tmp/usbdisk.img'], shell=False, check=True)
+    #subprocess.run(['mount', '-o', 'loop,ro', '-t', 'vfat', '/tmp/usbdisk.img', '/mnt'], shell=False, check=True)
+    # copy screenshot-tool.exe
+    # copy background.png
+    #subprocess.run(['umount', '/mnt'], shell=False, check=False)
+
+
+    subprocess.run(['modprobe', 'g_mass_storage', 'file=/tmp/usbdisk.img', 'stall=0', 'removable=1', 'iSerialNumber=1234567890'], shell=False, check=True)
 #tvservice -p
 # tvservice -e "DMT 82"
 # fbset -g 1920 1080 1920 1080 16
@@ -134,17 +145,20 @@ if __name__ == '__main__':
       print('file changed')
       subprocess.run(['killall', 'fim'], shell=False)
       subprocess.run(['umount', '/mnt'], shell=False, check=False)
-      subprocess.run(['mount', '-o', 'loop,ro,offset=1048576', '-t', 'vfat', '/usbdisk.img', '/mnt'], shell=False, check=True)
+      subprocess.run(['mount', '-o', 'loop,ro', '-t', 'vfat', '/tmp/usbdisk.img', '/mnt'], shell=False, check=True)
 
-      list_of_files = glob.glob('/mnt/*')
-      latest_file = max(list_of_files, key=os.path.getctime)
-      print (latest_file)
+      list_of_files = glob.glob('/mnt/*.png')
+      list_of_files.extend(glob.glob('/mnt/*.jpg'))
+      list_of_files.extend(glob.glob('/mnt/*.bmp'))
 
-      subprocess.run('fim -d /dev/fb0 -T 1 --autozoom --quiet '+paths[0], shell=True)
+      if list_of_files:
+        latest_file = max(list_of_files, key=os.path.getctime)
+        print(latest_file)
+        subprocess.run('fim -d /dev/fb0 -T 1 --autozoom --quiet "'+latest_file+'" &', shell=True)
       GPIO.output(23, GPIO.LOW)
 
 
-    watch_delay_call('/usbdisk.img', callback, 0.5, True, pyinotify.IN_MODIFY)
+    watch_delay_call('/tmp/usbdisk.img', callback, 0.5, True, pyinotify.IN_MODIFY)
 
   finally:
     GPIO.output(23, GPIO.LOW)
diff --git a/windows-snapshot-tool/src/main.cpp b/windows-snapshot-tool/src/main.cpp
index e6b3169..b669623 100644
--- a/windows-snapshot-tool/src/main.cpp
+++ b/windows-snapshot-tool/src/main.cpp
@@ -236,6 +236,21 @@ void getRaspiStorage() {
     // GetLogicalDrives()
     // for result
     // if result.GetDriveType() == DRIVE_REMOVABLE
+
+    TCHAR szName[MAX_PATH];
+    TCHAR szTemp[512];
+    TCHAR szDrive[3] = TEXT(" :");
+    szTemp[0] = '\0';
+    if (GetLogicalDriveStrings(BUFSIZE-1, szTemp)) 
+    {
+        BOOL bFound = FALSE;
+        for (TCHAR* p = szTemp; !bFound && *p; *p++;) {
+            *szDrive = *p;
+            if (QueryDosDevice(szDrive, szName, MAX_PATH))
+            {
+            }
+        }
+    }
 }