A quick way to apparently find hardware model/revision information (OSX 10.8.5): Select "About this Mac" from the apple menu, and click on "More info..." Clic

A quick way to apparently find hardware model/revision information (OSX 10.8.5): Select "About this Mac" from the apple menu, and click on "More info..." Click on "System Report" and select the SATA/SATAExpress page. Model and revision numbers for each installed hard drive appear to be reported here. (edit: presumably drives connected via USB are similarly described in the appropriate page of the diagnostics/report)