How do I determine the speed of a disk drive?

I'm looking for a way to determine the read/write speed of a disk drive, either by looking up some system information or running a simple benchmark test utility.

Xbench: Comprehensive Macintosh Benchmarking

Freeware benchmarking solution for Mac OS X.

EDIT: The download link is in the right-hand corner.

Main Window

Graphics Test

Blackmagic Disk Speed Test performs various tests and tells you how fast your disk is performing.

Phoronix Test Suite

I have not used it, but I plan to.

Discovered through the following article:

• [Phoronix] Early Benchmarks Of Mac OS X 10.7 Lion (2011-03-02, three pages).

Related

OpenBenchmarking.org — an open, collaborative testing platform for benchmarking and performance analysis

… an open, collaborative testing platform designed by Phoronix Media and the developers behind the Phoronix Test Suite, the most comprehensive benchmarking platform for Linux and other operating systems. …