root@neptune [/usr/src]# hdparm -tT /dev/sdb

/dev/sdb:
 Timing buffer-cache reads:   2528 MB in  2.00 seconds = 1263.93 MB/sec
 Timing buffered disk reads:   38 MB in  3.05 seconds =  12.45 MB/sec
root@neptune [/usr/src]# hdparm -tT /dev/sda

/dev/sda:
 Timing buffer-cache reads:   3096 MB in  2.00 seconds = 1547.91 MB/sec
 Timing buffered disk reads:   26 MB in  3.06 seconds =   8.50 MB/sec
root@neptune [/usr/src]# hdparm -tT /dev/md0

/dev/md0:
 Timing buffer-cache reads:   3004 MB in  2.00 seconds = 1501.91 MB/sec
 Timing buffered disk reads:   42 MB in  3.10 seconds =  13.55 MB/sec