DWORD
CPCIDiskAndCD::MainIoctl(
    PIOREQ pIOReq
    )
{
    DWORD dwError;
    DEBUGMSG(ZONE_IOCTL, (_T(
        "Atapi!CPCIDiskAndCD::MainIoctl> IOCTL(0x%x), device(%d) "
        ),pIOReq->dwCode, m_dwDeviceId));
    dwError = CPCIDisk::MainIoctl(pIOReq);
    
    if (dwError == ERROR_NOT_SUPPORTED) {

        switch(pIOReq->dwCode) {

            // supported ATAPI commands
            case IOCTL_CDROM_READ_SG:
            case IOCTL_CDROM_TEST_UNIT_READY:
            case IOCTL_CDROM_DISC_INFO:
            case IOCTL_CDROM_EJECT_MEDIA:
            case IOCTL_CDROM_LOAD_MEDIA:

            // supported DVD commands
            case IOCTL_DVD_START_SESSION:
            case IOCTL_DVD_READ_KEY:
            case IOCTL_DVD_END_SESSION:
            case IOCTL_DVD_SEND_KEY:
            case IOCTL_DVD_GET_REGION:

#if 0
            // supported audio commands
            case IOCTL_CDROM_READ_TOC:
            case IOCTL_CDROM_GET_CONTROL:
            case IOCTL_CDROM_PLAY_AUDIO_MSF:
            case IOCTL_CDROM_SEEK_AUDIO_MSF:
            case IOCTL_CDROM_STOP_AUDIO:
            case IOCTL_CDROM_PAUSE_AUDIO:
            case IOCTL_CDROM_RESUME_AUDIO:
            case IOCTL_CDROM_GET_VOLUME:
            case IOCTL_CDROM_SET_VOLUME:
            case IOCTL_CDROM_READ_Q_CHANNEL:
            case IOCTL_CDROM_GET_LAST_SESSION:
            case IOCTL_CDROM_RAW_READ:
            case IOCTL_CDROM_DISK_TYPE:
            case IOCTL_CDROM_SCAN_AUDIO:
            case IOCTL_CDROM_ISSUE_INQUIRY:
#endif

                if (IsAtapiDevice()) {
                    dwError = AtapiIoctl(pIOReq);
                }
                else {
                    dwError = ERROR_INVALID_OPERATION;
                }
                break;
            
            default:
                dwError = ERROR_NOT_SUPPORTED;
                break;
        }
    }
    return dwError;
}