HANDLE hDrv=CreateFile("\\\\.\\PhysicalDriveX", 0, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
SetFilePointer(hDrv, dwSectorNumber*512, NULL, FILE_BEGIN);
ReadFile(hDrv, vBuffer, 512, &dwBytesRead, NULL);