On Linux I would usually use "hdparm -tT device" when I want a quick idea of how an hard drive is performing compared to another; having switched to Mac OS X a few months back I have yet to find something similar and as easy to use.
I have read that diskutil can do similar things on Mac but I am not clear about how I should use it to do something similar to the hdparm command above.
Any ideas on how to do this or on alternatives? Thanks!