hdparm and hd performance

[Anthony Fox <adf5j@cs.virginia.edu>]

Hello,

I have two IBM 75GXP 15.3G harddrives.  The IBM website states that this
particular drive can sustain data transfer rates of 37MB/sec.  I am
attempting to use hdparm to check my harddrive performance.  I get the
following values:

Timing buffered disk reads:  64 MB in 21.64 seconds =  2.96 MB/sec
Timing buffer-cache reads:   128 MB in  1.09 seconds =117.43 MB/sec

I am fairly certain that I am using ATA/66 as that is what my BIOS tells
me.

So, my question is: am I missing something completely obvious or are these
performance values way below the stated specs?

Any help would be appreciated.

Thanks.
-Anthony.