/dev/sda:
 Timing buffer-cache reads:   844 MB in  2.00 seconds = 422.00 MB/sec
 Timing buffered disk reads:   84 MB in  3.05 seconds =  27.54 MB/sec
[root@serwer /]# hdparm -tT /dev/sdb

/dev/sdb:
 Timing buffer-cache reads:   852 MB in  2.00 seconds = 426.00 MB/sec
 Timing buffered disk reads:  154 MB in  3.00 seconds =  51.33 MB/sec