pc1:~# hdparm -tT /dev/hdd

/dev/hdd:
read() failed: Input/output error
 Timing buffered disk reads:  read() failed: Input/output error
pc1:~# hdparm -tT /dev/hda

/dev/hda:
 Timing cached reads:   1488 MB in  2.01 seconds = 740.30 MB/sec
 Timing buffered disk reads:  148 MB in  3.01 seconds =  49.17 MB/sec
pc1:~# hdparm -tT /dev/hdd

/dev/hdd:
 Timing cached reads:   1732 MB in  2.00 seconds = 866.00 MB/sec
 Timing buffered disk reads:   14 MB in  3.40 seconds =   4.12 MB/sec
pc1:~#