static extern uint GetLogicalDriveStrings(uint bufferLength, [Out] char[] buffer);

static extern uint GetLogicalDriveStrings(uint bufferLength, [Out] StringBuilder buffer);

    static extern uint GetLogicalDriveStrings(uint bufferLength, [Out] char[] buffer);

       uint code = GetLogicalDriveStrings(size, buffer);

public static string[] System.Environment.GetLogicalDrives();

// static extern uint GetLogicalDriveStrings(uint nBufferLength,

static extern uint GetLogicalDriveStrings(uint nBufferLength, [Out] char[] lpBuffer);

static extern uint GetLogicalDriveStrings(uint nBufferLength, [Out] char[] lpBuffer);

    uint code = GetLogicalDriveStrings(size, buffer);

public static string[] System.Environment.GetLogicalDrives();