Script to rename hard drive not working.

I to start off a script by renaming the hard dirve. I wrote this one but it done not seem to be working.


on open (thisDrive)
	tell application "Finder"
		set name of thisDrive to "Macintosh HD" 
	end tell
end open

I get the error can’t set name of {alias “Untitled 4:”} to “Macintosh HD”