Now it’s time to sum up all the results and see what HDD is better overall. If you need maximum performance, you may be interested in two models: Western Digital Scorpio Blue and Seagate Momentus 7200.4. The former is somewhat better for databases or similar data structures whereas the latter is better for ordinary uses, especially for reading rather than for writing.
If power efficiency is your priority, you may want to consider the Fujitsu MJA2 BH or the Hitachi Travelstar 5K500.B. Overall, each of the HDDs based on 250GB platters is superior to the early 500GB drives based on 3 platters, so it is no wonder that the first generation of 500GB 2.5-inch HDDs has been so quickly replaced with the current one.