[root@gsx dev]# hdparm -cd /dev/cdrom

/dev/cdrom:
 IO_support   =  1 (32-bit)
 using_dma    =  1 (on)

[root@gsx dev]# hdparm -cd /dev/cdrom

/dev/cdrom:
 IO_support   =  1 (32-bit)
 using_dma    =  1 (on)
[root@gsx dev]# hdparm -cd /dev/hda
hda   hda1  hda2  hda5  hda6  hda7  
[root@gsx dev]# hdparm -cd /dev/hda

/dev/hda:
 IO_support   =  1 (32-bit)
 using_dma    =  1 (on)
[root@gsx dev]# hdparm -cd /dev/hdb

/dev/hdb:
 IO_support   =  1 (32-bit)
 using_dma    =  1 (on)

[root@gsx dev]# hdparm -cd /dev/hdd

/dev/hdd:
 IO_support   =  1 (32-bit)
 using_dma    =  1 (on)