chuy@ubuntu:~/prog$ sudo hdparm /dev/scd0 |grep dma
 HDIO_GET_UNMASKINTR failed: Inappropriate ioctl for device
 HDIO_GET_DMA failed: Inappropriate ioctl for device
 HDIO_GET_KEEPSETTINGS failed: Inappropriate ioctl for device
 HDIO_GETGEO failed: Inappropriate ioctl for device