Applescript app won't quit

Question

I need a little help.  I have written an AppleScript app that "touches" one of my external drives every 55 seconds to keep it from spinning down.  However, this app won't quit when I depress command-Q ... even though I have included an "on quit" handler.  Can anyone suggest what I need to change to have this app respond properly to command-Q?  Here's the script:
with timeout of 99999999 seconds
          tell application "Finder"
  activate
                    repeat
       do shell script "touch -a /Volumes/TimeMachine/.TemporaryItems"
       delay 55
                    end repeat
          end tell
end timeout
on quit
       continue quit
end quit

Answer 1

AppleScript is not multi-threaded, so the application will never get the quit message because the repeat loop never finishes.  Sitting in a continual repeat loop is not the way to go since it blocks the user interface - instead, resave your application with the option to stay open, and use the idle handler (note that the Finder is not needed for the do shell script command):
on idle
  do shell script "touch -a /Volumes/TimeMachine/.TemporaryItems"
  return 55
end idle