en win7 no funciona esta funcion pa sacar ID unico del disco duro

[darkbits]

un saludo al Club
tengo eta dificulta
esta es una de las mejores funciones que encontre para sacar el ID unico del disco duro y funciona perfectamente en winXP pero cuando lo ejecuto en win7 no me sale nada.. no probe en win vista

les facilito el codigo por ahi a que hacer una modificacion para que funcione en todos los windows

o si tiene alguna otra funcion mucho mas completo y que funcione en todos los win les agradesco.

Código Delphi [-]
/////////////////////////////////////////////////
// Get first IDE harddisk serial number 
function GetIdeSerialNumber : SerialNumber; 
const IDENTIFY_BUFFER_SIZE = 512; 
type 
  TIDERegs = packed record 
    bFeaturesReg     : BYTE; // Used for specifying SMART "commands". 
    bSectorCountReg  : BYTE; // IDE sector count register 
    bSectorNumberReg : BYTE; // IDE sector number register 
    bCylLowReg       : BYTE; // IDE low order cylinder value 
    bCylHighReg      : BYTE; // IDE high order cylinder value 
    bDriveHeadReg    : BYTE; // IDE drive/head register 
    bCommandReg      : BYTE; // Actual IDE command. 
    bReserved        : BYTE; // reserved for future use.  Must be zero. 
  end; 
  TSendCmdInParams = packed record 
    // Buffer size in bytes 
    cBufferSize  : DWORD; 
    // Structure with drive register values. 
    irDriveRegs  : TIDERegs; 
    // Physical drive number to send command to (0,1,2,3). 
    bDriveNumber : BYTE; 
    bReserved    : Array[0..2] of Byte; 
    dwReserved   : Array[0..3] of DWORD; 
    bBuffer      : Array[0..0] of Byte;  // Input buffer. 
  end; 
  TIdSector = packed record 
    wGenConfig                 : Word; 
    wNumCyls                   : Word; 
    wReserved                  : Word; 
    wNumHeads                  : Word; 
    wBytesPerTrack             : Word; 
    wBytesPerSector            : Word; 
    wSectorsPerTrack           : Word; 
    wVendorUnique              : Array[0..2] of Word; 
    sSerialNumber              : Array[0..19] of CHAR; 
    wBufferType                : Word; 
    wBufferSize                : Word; 
    wECCSize                   : Word; 
    sFirmwareRev               : Array[0..7] of Char; 
    sModelNumber               : Array[0..39] of Char; 
    wMoreVendorUnique          : Word; 
    wDoubleWordIO              : Word; 
    wCapabilities              : Word; 
    wReserved1                 : Word; 
    wPIOTiming                 : Word; 
    wDMATiming                 : Word; 
    wBS                        : Word; 
    wNumCurrentCyls            : Word; 
    wNumCurrentHeads           : Word; 
    wNumCurrentSectorsPerTrack : Word; 
    ulCurrentSectorCapacity    : DWORD; 
    wMultSectorStuff           : Word; 
    ulTotalAddressableSectors  : DWORD; 
    wSingleWordDMA             : Word; 
    wMultiWordDMA              : Word; 
    bReserved                  : Array[0..127] of BYTE; 
  end; 
  PIdSector = ^TIdSector; 
  TDriverStatus = packed record 
    // Error code from driver, or 0 if no error. 
    bDriverError : Byte; 
    // Contents of IDE Error register. Only valid when bDriverError is SMART_IDE_ERROR. 
    bIDEStatus   : Byte; 
    bReserved    : Array[0..1] of Byte; 
    dwReserved   : Array[0..1] of DWORD; 
  end; 
  TSendCmdOutParams = packed record 
    // Size of bBuffer in bytes 
    cBufferSize  : DWORD; 
    // Driver status structure. 
    DriverStatus : TDriverStatus; 
    // Buffer of arbitrary length in which to store the data read from the drive. 
    bBuffer      : Array[0..0] of BYTE; 
  end; 
var hDevice : THandle; 
    cbBytesReturned : DWORD; 
    ptr : PChar; 
    SCIP : TSendCmdInParams; 
    aIdOutCmd : Array [0..(SizeOf(TSendCmdOutParams)+IDENTIFY_BUFFER_SIZE-1)-1] of Byte; 
    IdOutCmd  : TSendCmdOutParams absolute aIdOutCmd; 
  procedure ChangeByteOrder( var Data; Size : Integer ); 
  var ptr : PChar; 
      i : Integer; 
      c : Char; 
  begin 
    ptr := @Data; 
    for i := 0 to (Size shr 1)-1 do 
    begin 
      c := ptr^; 
      ptr^ := (ptr+1)^; 
      (ptr+1)^ := c; 
      Inc(ptr,2); 
    end; 
  end; 
begin 
  Result := ''; // return empty string on error 
  if SysUtils.Win32Platform=VER_PLATFORM_WIN32_NT then // Windows NT, Windows 2000 
    begin 
      // warning! change name for other drives: ex.: second drive '\\.\PhysicalDrive1\' 
      hDevice := CreateFile( '\\.\PhysicalDrive0', GENERIC_READ or GENERIC_WRITE, 
        FILE_SHARE_READ or FILE_SHARE_WRITE, nil, OPEN_EXISTING, 0, 0 ); 
    end 
  else // Version Windows 95 OSR2, Windows 98 
    hDevice := CreateFile( '\\.\SMARTVSD', 0, 0, nil, CREATE_NEW, 0, 0 ); 
  if hDevice=INVALID_HANDLE_VALUE then Exit; 
  try 
    FillChar(SCIP,SizeOf(TSendCmdInParams)-1,#0); 
    FillChar(aIdOutCmd,SizeOf(aIdOutCmd),#0); 
    cbBytesReturned := 0; 
    // Set up data structures for IDENTIFY command. 
    with SCIP do 
    begin 
      cBufferSize  := IDENTIFY_BUFFER_SIZE; 
//      bDriveNumber := 0; 
      with irDriveRegs do 
      begin 
        bSectorCountReg  := 1; 
        bSectorNumberReg := 1; 
//      if Win32Platform=VER_PLATFORM_WIN32_NT then bDriveHeadReg := $A0 
//      else bDriveHeadReg := $A0 or ((bDriveNum and 1) shl 4); 
        bDriveHeadReg    := $A0; 
        bCommandReg      := $EC; 
      end; 
    end; 
    if not DeviceIoControl( hDevice, $0007c088, @SCIP, SizeOf(TSendCmdInParams)-1, 
      @aIdOutCmd, SizeOf(aIdOutCmd), cbBytesReturned, nil ) then Exit; 
  finally 
    CloseHandle(hDevice); 
  end; 
  with PIdSector(@IdOutCmd.bBuffer)^ do 
  begin 
    ChangeByteOrder( sSerialNumber, SizeOf(sSerialNumber) ); 
    (PChar(@sSerialNumber)+SizeOf(sSerialNumber))^ := #0; 
    Result := PChar(@sSerialNumber); 
  end; 
end;

aqui llamo de cualquier edit o label

Código Delphi [-]
///////////////////
llamar a 
label1.Caption := GetIdeSerialNumber;