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Determine the Drive Letter of the Primary Hard Drive

To determine the user's main hard drive in AutoPlay Media Studio, use the Drive.Enumerate action, and take note of the first fixed drive (this is the main hard drive):

-- Get a list of all drives in the user's system
drives = Drive.Enumerate();

-- Step through the returned list
for j in pairs(drives) do
   -- Get the type of the drive
    type = Drive.GetType(drives[j]);

   -- Check if the type of drive is fixed
    if type == 3 then
       -- It is fixed, note the drive letter and break out of the loop
        first_hdd = drives[j];
       break;
    end
end

-- Output result to the user
Dialog.Message("", "The user's main HDD is "..first_hdd);