I am running Bonnie and hdparm to get the disk performance but the results of the 2 programs are totally different. It seems to me that Bonnie is not giving me correct results. Can someone please help me to decide which results are correct?

hdparm -t /dev/sda

/dev/sda:
Timing buffered disk reads: 64 MB in 3.86 seconds = 16.58 MB/sec
(plxb0026, Linux 2.4.9-41lxset1smp) [9:49am] ~/perform/scripts # cd bonnie/

~/bonnie # ./Bonnie -d /tmp/scra
File '/tmp/scra/Bonnie.19460', size: 104857600
Writing with putc()...done
Rewriting...done
Writing intelligently...done
Reading with getc()...done
Reading intelligently...done
Seeker 1...Seeker 2...Seeker 3...start 'em...done...done...done...
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
100 29286 100.1 221697 101.8 453834 97.5 29200 99.8 905089 97.2 55205.2 317.4