Private Function DirectReadDriveNT(ByVal sDrive As String, ByVal iStartSec As _
  Long, ByVal iOffset As Long, ByVal cBytes As Long) As Variant
    Dim hDevice As Long
    Dim abBuff() As Byte
    Dim abResult() As Byte
    Dim nSectors As Long
    Dim nRead As Long
    nSectors = Int((iOffset + cBytes - 1) / BytesPerSector) + 1
    hDevice = CreateFile("\\.\" & UCase(Left(sDrive, 1)) & ":", GENERIC_READ Or _
      GENERIC_WRITE, FILE_SHARE_READ Or FILE_SHARE_WRITE, 0&, OPEN_EXISTING, _
      0&, 0&)
    If hDevice = INVALID_HANDLE_VALUE Then Exit Function
    Call SetFilePointer(hDevice, iStartSec * BytesPerSector, 0, FILE_BEGIN)
    ReDim abResult(cBytes - 1)
    ReDim abBuff(nSectors * BytesPerSector - 1)
    Call ReadFile(hDevice, abBuff(0), UBound(abBuff) + 1, nRead, 0&)
    CloseHandle hDevice
    CopyMemory abResult(0), abBuff(iOffset), cBytes
    DirectReadDriveNT = abResult
End Function
 
Private Function DirectWriteDriveNT(ByVal sDrive As String, ByVal iStartSec As _
  Long, ByVal iOffset As Long, ByVal sWrite As String) As Boolean
    Dim hDevice As Long
    Dim abBuff() As Byte
    Dim ab() As Byte
    Dim nRead As Long
    Dim nSectors As Long
    nSectors = Int((iOffset + Len(sWrite) - 1) / BytesPerSector) + 1
    hDevice = CreateFile("\\.\" & UCase(Left(sDrive, 1)) & ":", GENERIC_READ Or _
      GENERIC_WRITE, FILE_SHARE_READ Or FILE_SHARE_WRITE, 0&, OPEN_EXISTING, _
      0&, 0&)
    If hDevice = INVALID_HANDLE_VALUE Then Exit Function
    abBuff = DirectReadDriveNT(sDrive, iStartSec, 0, nSectors * BytesPerSector)
    ab = StrConv(sWrite, vbFromUnicode)
    CopyMemory abBuff(iOffset), ab(0), Len(sWrite)
    Call SetFilePointer(hDevice, iStartSec * BytesPerSector, 0, FILE_BEGIN)
    Call LockFile(hDevice, LoWord(iStartSec * BytesPerSector), HiWord(iStartSec _
      * BytesPerSector), LoWord(nSectors * BytesPerSector), HiWord(nSectors * _
      BytesPerSector))
    DirectWriteDriveNT = WriteFile(hDevice, abBuff(0), UBound(abBuff) + 1, _
    nRead, 0&)
    Call FlushFileBuffers(hDevice)
    Call UnlockFile(hDevice, LoWord(iStartSec * BytesPerSector), HiWord( _
      iStartSec * BytesPerSector), LoWord(nSectors * BytesPerSector), HiWord( _
      nSectors * BytesPerSector))
    CloseHandle hDevice
End Function

(auch hierzu hab ich keine Infos gefunden )

    Call LockFile(hDevice, LoWord(iStartSec * BytesPerSector), HiWord(iStartSec _
      * BytesPerSector), LoWord(nSectors * BytesPerSector), HiWord(nSectors * _
      BytesPerSector))
 
[....]
 
    Call FlushFileBuffers(hDevice)
    Call UnlockFile(hDevice, LoWord(iStartSec * BytesPerSector), HiWord( _
      iStartSec * BytesPerSector), LoWord(nSectors * BytesPerSector), HiWord( _
      nSectors * BytesPerSector))