michael michael # hdparm -tT /dev/sd[abc]

/dev/sda:
 Timing cached reads:   2412 MB in  2.00 seconds = 1205.69 MB/sec
 Timing buffered disk reads:  188 MB in  3.01 seconds =  62.46 MB/sec

/dev/sdb:
 Timing cached reads:   2560 MB in  2.00 seconds = 1280.26 MB/sec
 Timing buffered disk reads:  178 MB in  3.03 seconds =  58.69 MB/sec

/dev/sdc:
 Timing cached reads:   2584 MB in  2.00 seconds = 1291.38 MB/sec
 Timing buffered disk reads:  160 MB in  3.00 seconds =  53.32 MB/sec