取Ide硬盘序列号函数，在XP下无法使用。(50分)

此函数是读取硬盘ID的函数，在WIN98,W2K下可以使用，可是到XP下面就不好使了，
那位大虾知道怎么解决？
function GetIdeDiskSerialNumber : String;
type
TSrbIoControl = packed record
HeaderLength : ULONG;
Signature : Array[0..7] of Char;
Timeout : ULONG;
ControlCode : ULONG;
ReturnCode : ULONG;
Length : ULONG;
end;
SRB_IO_CONTROL = TSrbIoControl;
PSrbIoControl = ^TSrbIoControl;

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. Must be zero.
end;
IDEREGS = TIDERegs;
PIDERegs = ^TIDERegs;

TSendCmdInParams = packed record
cBufferSize : DWORD;
irDriveRegs : TIDERegs;
bDriveNumber : Byte;
bReserved : Array[0..2] of Byte;
dwReserved : Array[0..3] of DWORD;
bBuffer : Array[0..0] of Byte;
end;
SENDCMDINPARAMS = TSendCmdInParams;
PSendCmdInParams = ^TSendCmdInParams;

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 : ULONG;
wMultSectorStuff : Word;
ulTotalAddressableSectors : ULONG;
wSingleWordDMA : Word;
wMultiWordDMA : Word;
bReserved : Array[0..127] of Byte;
end;
PIdSector = ^TIdSector;

const
IDE_ID_FUNCTION = $EC;
IDENTIFY_BUFFER_SIZE = 512;
DFP_RECEIVE_DRIVE_DATA = $0007c088;
IOCTL_SCSI_MINIPORT = $0004d008;
IOCTL_SCSI_MINIPORT_IDENTIFY = $001b0501;
DataSize = sizeof(TSendCmdInParams)-1+IDENTIFY_BUFFER_SIZE;
BufferSize = SizeOf(SRB_IO_CONTROL)+DataSize;
W9xBufferSize = IDENTIFY_BUFFER_SIZE+16;
var
hDevice : THandle;
cbBytesReturned : DWORD;
pInData : PSendCmdInParams;
pOutData : Pointer; // PSendCmdOutParams
Buffer : Array[0..BufferSize-1] of Byte;
srbControl : TSrbIoControl absolute Buffer;

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 := '';
FillChar(Buffer,BufferSize,#0);
if Win32Platform=VER_PLATFORM_WIN32_NT then
begin // Windows NT, Windows 2000
// Get SCSI port handle
hDevice := CreateFile( '//./Scsi0:',
GENERIC_READ or GENERIC_WRITE,
FILE_SHARE_READ or FILE_SHARE_WRITE,
nil, OPEN_EXISTING, 0, 0 );
if hDevice=INVALID_HANDLE_VALUE then Exit;
try
srbControl.HeaderLength := SizeOf(SRB_IO_CONTROL);
System.Move('SCSIDISK',srbControl.Signature,8);
srbControl.Timeout := 2;
srbControl.Length := DataSize;
srbControl.ControlCode := IOCTL_SCSI_MINIPORT_IDENTIFY;
pInData := PSendCmdInParams(PChar(@Buffer)
+SizeOf(SRB_IO_CONTROL));
pOutData := pInData;
with pInData^ do
begin
cBufferSize := IDENTIFY_BUFFER_SIZE;
bDriveNumber := 0;
with irDriveRegs do
begin
bFeaturesReg := 0;
bSectorCountReg := 1;
bSectorNumberReg := 1;
bCylLowReg := 0;
bCylHighReg := 0;
bDriveHeadReg := $A0;
bCommandReg := IDE_ID_FUNCTION;
end;
end;
if not DeviceIoControl( hDevice, IOCTL_SCSI_MINIPORT,
@Buffer, BufferSize, @Buffer, BufferSize,
cbBytesReturned, nil ) then Exit;
finally
CloseHandle(hDevice);
end;
end
else
begin // Windows 95 OSR2, Windows 98
hDevice := CreateFile( '//./SMARTVSD', 0, 0, nil,
CREATE_NEW, 0, 0 );
if hDevice=INVALID_HANDLE_VALUE then Exit;
try
pInData := PSendCmdInParams(@Buffer);
pOutData := @pInData^.bBuffer;
with pInData^ do
begin
cBufferSize := IDENTIFY_BUFFER_SIZE;
bDriveNumber := 0;
with irDriveRegs do
begin
bFeaturesReg := 0;
bSectorCountReg := 1;
bSectorNumberReg := 1;
bCylLowReg := 0;
bCylHighReg := 0;
bDriveHeadReg := $A0;
bCommandReg := IDE_ID_FUNCTION;
end;
end;
if not DeviceIoControl( hDevice, DFP_RECEIVE_DRIVE_DATA,
pInData, SizeOf(TSendCmdInParams)-1, pOutData,
W9xBufferSize, cbBytesReturned, nil ) then Exit;
finally
CloseHandle(hDevice);
end;
end;
with PIdSector(PChar(pOutData)+16)^ do
begin
ChangeByteOrder(sSerialNumber,SizeOf(sSerialNumber));
SetString(Result,sSerialNumber,SizeOf(sSerialNumber));
end;
end;

用这个：
//获得硬盘序列号

function GetIdeSerialNumber: pchar;
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
// 驱动器返回的错误代码，无错则返回0
bDriverError: Byte;
// IDE出错寄存器的内容，只有当bDriverError 为 SMART_IDE_ERROR 时有效
bIDEStatus: Byte;
bReserved: array[0..1] of Byte;
dwReserved: array[0..1] of DWORD;
end;
TSendCmdOutParams = packed record
// bBuffer的大小
cBufferSize: DWORD;
// 驱动器状态
DriverStatus: TDriverStatus;
// 用于保存从驱动器读出的数据的缓冲区，实际长度由cBufferSize决定
bBuffer: array[0..0] of BYTE;
end;
var
hDevice: Thandle;
cbBytesReturned: DWORD;
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 := ''; // 如果出错则返回空串
if SysUtils.Win32Platform = VER_PLATFORM_WIN32_NT then begin // Windows NT, Windows 2000
// 提示! 改变名称可适用于其它驱动器，如第二个驱动器： '//./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;