hdparm /dev/sda とかやっても DMA かどうかとかの情報が見れないなぁ。

$ sudo hdparm /dev/sda 

/dev/sda:
 IO_support   =  0 (default 16-bit)
 readonly     =  0 (off)
 readahead    = 256 (on)
 geometry     = 30401/255/63, sectors = 488397168, start = 0