Получение свободных букв дисков: Справочник по C#

/// 

/// method to retrieve all available drive letters
/// 
/// 
public List GetAvailableDriveLetters()
{
List letters = new List();

//first let's get all avilable drive letters
for (int i = Convert.ToInt16('a'); i < Convert.ToInt16('z'); i++)
letters.Add(new string(new char[] { (char)i }));

//now loop through each and remove it's drive letter from our list
foreach (DriveInfo drive in DriveInfo.GetDrives())
letters.Remove(drive.Name.Substring(0, 1).ToLower());

//return the letters left
return letters;
}

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