Determine the maximum free disk space

Problem/Question/Abstract:

I need a function to get the local disk with the maximum free space.

Answer:

uses
  Windows;

{ ... }
var
  lpFreeBytesAvailableToCaller, lpTotalNumberOfBytes, lpTotalNumberOfFreeBytes:
    PLargeInteger;
begin
  New(lpFreeBytesAvailableToCaller);
  New(lpTotalNumberOfBytes);
  New(lpTotalNumberOfFreeBytes);
  try
    GetDiskFreeSpaceEx('C:', lpFreeBytesAvailableToCaller, lpTotalNumberOfBytes,
      lpTotalNumberOfFreeBytes);
  finally
    Dispose(lpFreeBytesAvailableToCaller);
    Dispose(lpTotalNumberOfBytes);
    Dispose(lpTotalNumberOfFreeBytes);
  end;
end;