Newbie Prod in right direction needed...

Hi,
I'm looking to create an apple script that will only open itunes at login if the external drive the library is stored on is mounted?

Here:
tell application "Finder"
set disk_exists to exists disk "Macintosh HD"
end tell
if disk_exists then
tell application "iTunes"
run
end tell
end if
with Macintosh HD replaced with the disk's name in the Finder.
(21077)

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