Step 01. Open the Apple Automator application and chose Custom.
Step 02. Select Files & Folders in the far left column and Get Specified Servers in the middle column.
Step 03. Drag Get Specified Servers over to the right column.
Your screen should now look like this.
Step 04. Click Add and enter the IP address of your Airport Extreme Base Station in this format. If you don't know the IP address of your AEBS open the airport utility and the address will be displayed on the opening page.
Select OK and your screen should look like this.
Step 05. Select Files & Folders in the far left column and Connect to Servers in the middle column. Then drag Connect to Servers over to the right column.
Your screen should look like this
Step 06. Select your AirDisk on your desktop and drag it into the Connect to Servers box as shown below.
Step 07. Select File > Save As
Call this new creation Mount AirDisk, save it to your favorite location, and make sure the file format says Application.
Step 08. Go into System Preferences
Step 09. Under System, select Accounts
Step 10. Select your account on the left. Make sure Login Items is selected on the right. Then select your newly created application called Mount AirDisk in the spot you previously saved it. Drag that application into the Login Items window.
That's it your done. Every time you restart your Mac the hard drive connected to your Airport Extreme Base Station will automatically mount. Thus, whenever you open iTunes there is no need to worry about mounting your music folder first.
If you would like to use the application I created instead of creating your own you will need to make sure your AEBS is using the same internal IP addressing scheme that mine is. Fortunately this is really easy and Apple only gives you the choice of three different selections.
Open the airport utility, select Manual Setup, select Internet, select DHCP, then select 10.0. from the drop down list. Enter the number 1 in the box next to this selection. Just below that, in the DHCP Beginning Address box enter the number 2. In the DHCP Ending Address box enter the number 200 (any number between 2 and 255 can be entered, but 200 will give you plenty of addresses for a home network). Click Update at the bottom.
Then download and unzip this file containing the pre-made Mount AirDisk application.
If you want your AirDisk to mount at startup you'll need to go back up to Step 08 and proceed from there. That's it, your done mounting your AirDisk manually!