3des ~ # hdparm -Tt /dev/sda

/dev/sda:
 Timing cached reads:   1384 MB in  2.00 seconds = 691.71 MB/sec
 Timing buffered disk reads:  224 MB in  3.01 seconds =  74.36 MB/sec
3des ~ # hdparm -Tt /dev/sdb

/dev/sdb:
 Timing cached reads:   1324 MB in  2.00 seconds = 661.59 MB/sec
 Timing buffered disk reads:  210 MB in  3.00 seconds =  69.93 MB/sec