Everest Random Access Time
Everest Ultimate and Corporate Edition offer several different benchmarks for testing and optimizing your system or network. The Random Access test is one of very few if not only that will measure hard drives random access times in hundredths of milliseconds as oppose to tens of milliseconds.
Drives with only one or two tests displayed in write the write test mean that they have failed the test and their Maximum and possibly their Average Scores were very high after the cached fills. This usually happens only with controllers manufactured by JMicron.
All of the Constellation and Constellation.2 drives in the chart operate at 7,200 RPM, so it's no surprise that all three access data at the same rates. The Western Digital VelociRaptor is a 10K RPM model, so it has the lowest access time.
The write access time is also very close with the Constellation drives in the chart and the same applies here. With all three drives being so close together on the timeline, not a lot of advancements were made in this area.