Index: SDDs/Storage_Popup.png
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Index: SDDs/Storage_Popup.puml
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--- SDDs/Storage_Popup.puml	(revision 0)
+++ SDDs/Storage_Popup.puml	(revision ffdd4d014695ac2e1c62a53c756d24dec6ed3f9a)
@@ -0,0 +1,55 @@
+@startuml Storage_Popup
+
+    participant SW                  as SW
+    participant UI                  as UI
+    actor       USER                as US
+
+    'Possible actions and interaction types
+    ' External on CANBus
+    ' TD -> SW: MSG: Message
+    ' SW -> TD: MSG: Message
+
+    ' Internal to the application
+    ' XX -> YY: CMD: Command
+    ' XX -> XX: ACT: Action
+
+    ' External on OS/FS
+    ' SW -> Script: ACT: Command
+    ' Script -> OS: CMD: Command
+    ' Script -> SW: MSG: Message
+    ' OS -> Script: MSG: Message
+
+    ' US -> UI: User actions are:
+    '   ASK: Display a <message>
+    '   ENT: User enters a value or string
+    '   TCH: User touches a button (RadioButton, CheckBox, ...)
+    '   SCL: User scrolls a flip-able area
+
+    == Storage Popup ==
+    loop QTimerEvent
+        SW ->o SW: ⟲: ACT: sdcardSpaceCheck()\
+                    \n\t Checks for the SD-Card drive space
+    
+        alt SD-Card is mounted and ready 
+            SW -> UI: MSG: emit didSDCardSpaceChange()  \
+                    \n\tReady                           \
+                    \n\tTotal                           \
+                    \n\tAvailable                       \
+                    \n\tPercentage                       
+
+        else SD-Card Not Ready
+            SW -> UI: MSG: emit didSDCardSpaceChange()  \
+                    \n\tReady                           \
+                    \n\tTotal                           \
+                    \n\tAvailable = 0                   \
+                    \n\tPercentage = 0      
+        end
+    end
+
+    US -> UI: TCH: User touches a storage button
+    UI -> UI: ACT: Display SD-Card Information: \
+                \n\t\tReady Status                \
+                \n\t\tPercentage of Free Space    \
+                \n\t\tAvailable Space (MB)        \
+                \n\t\tTotal Space (MB)   
+@enduml