root@berault:~$ hdparm -t /dev/hdc

/dev/hdc:
 Timing buffered disk reads:   10 MB in  3.13 seconds =   3.19 MB/sec
root@berault:~$ hdparm -d 1 /dev/hdc

/dev/hdc:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 using_dma    =  0 (off)
root@berault:~$ lspci
...
00:1d.5 PIC: Intel Corporation 6300ESB I/O Advanced Programmable Interrupt Controller (rev 02)
00:1d.7 USB Controller: Intel Corporation 6300ESB USB2 Enhanced Host Controller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 0a)
00:1f.0 ISA bridge: Intel Corporation 6300ESB LPC Interface Controller (rev 02)
00:1f.2 IDE interface: Intel Corporation 6300ESB SATA Storage Controller (rev 02)
00:1f.3 SMBus: Intel Corporation 6300ESB SMBus Controller (rev 02)
...
root@berault:~$ lsmod
Module                  Size  Used by    Not tainted
nfs                    72408   1
nfsd                   68208   8
lockd                  48848   1  [nfs nfsd]
sunrpc                 66780   1  [nfs nfsd lockd]
parport_pc             25128   1  (autoclean)
lp                      7460   0  (unused)
parport                22496   1  [parport_pc lp]
autofs4                 8756   2
efs                     7436   0  (unused)
af_packet              13544   0  (unused)
i810_audio             25048   0  (unused)
ac97_codec             11884   0  [i810_audio]
soundcore               3428   2  [i810_audio]
e1000                  62696   1
hw_random               2700   0  (unused)
serial                 52068   0  (unused)
keybdev                 1792   0  (unused)
mousedev                3832   0  (unused)
hid                    22564   0  (unused)
input                   3168   0  [keybdev mousedev hid]
pcmcia_core            39840   0  (unused)
thermal                 6692   0  (unused)
processor               9008   0  [thermal]
fan                     1600   0  (unused)
button                  2700   0  (unused)
battery                 5952   0  (unused)
ac                      1792   0
rtc                     7004   0
sbp2                   16588   0  (unused)
ohci1394               22888   0  (unused)
ieee1394              183300   0  [sbp2 ohci1394]
usb-storage            62016   0  (unused)
usb-uhci               21836   0  (unused)
usbcore                57824   1  [hid usb-storage usb-uhci]
ataraid                 6404   0  (unused)
ide-scsi                9040   0
ext3                   64388   3  (autoclean)
jbd                    46804   3  (autoclean) [ext3]
root@berault:~$