Add comprehensive debugging for diskpart script creation issues

- Add detailed status messages for each directory attempt
- Explicit UTF-8 encoding for script file creation
- Verify file exists and has content after creation
- Enhanced error reporting with specific failure reasons
- Better handling of permission errors vs other exceptions
- Final verification before using script path
- Will help identify exactly where script creation fails

usb_creator_gui.py

@@ -314,30 +314,54 @@ exit
         last_error = None
         
         # Try each directory until we find one that works
-        for temp_dir in candidate_dirs:
-            if not temp_dir or not os.path.exists(temp_dir):
+        self.status.emit("Attempting to create diskpart script...")
+        for i, temp_dir in enumerate(candidate_dirs):
+            if not temp_dir:
+                self.status.emit(f"Directory {i+1}: Empty directory path, skipping")
+                continue
+                
+            if not os.path.exists(temp_dir):
+                self.status.emit(f"Directory {i+1}: {temp_dir} does not exist, skipping")
                 continue
                 
             try:
                 candidate_path = os.path.join(temp_dir, script_filename)
+                self.status.emit(f"Directory {i+1}: Trying to create script at {candidate_path}")
                 
-                # Try to write script file
-                with open(candidate_path, 'w') as script_file:
+                # Try to write script file with explicit encoding
+                with open(candidate_path, 'w', encoding='utf-8') as script_file:
                     script_file.write(diskpart_script)
                 
                 # Verify file exists and is readable
-                if os.path.exists(candidate_path):
-                    script_path = candidate_path
-                    self.status.emit(f"Created diskpart script: {script_path}")
-                    break
+                if os.path.exists(candidate_path) and os.path.isfile(candidate_path):
+                    # Verify we can read the file back
+                    with open(candidate_path, 'r', encoding='utf-8') as verify_file:
+                        content = verify_file.read()
+                        if content.strip():  # File has content
+                            script_path = candidate_path
+                            self.status.emit(f"SUCCESS: Created diskpart script at {script_path} (Size: {len(content)} chars)")
+                            break
+                        else:
+                            self.status.emit(f"Directory {i+1}: File created but empty, trying next...")
+                else:
+                    self.status.emit(f"Directory {i+1}: File creation appeared successful but file not found")
                     
+            except PermissionError as e:
+                self.status.emit(f"Directory {i+1}: Permission denied - {e}")
+                last_error = e
+                continue
             except Exception as e:
+                self.status.emit(f"Directory {i+1}: Failed - {e}")
                 last_error = e
                 continue
         
         if not script_path:
             raise Exception(f"Failed to create diskpart script in any accessible directory. Last error: {last_error}")
         
+        # Final verification before using the script
+        if not os.path.exists(script_path):
+            raise Exception(f"Diskpart script was created but is no longer accessible at {script_path}")
+        
         try:
             # Run diskpart to format the USB drive
             self.status.emit("Formatting USB drive...")