Rather than a encode test, we added a number of changes to the movie including audio, video transition, splits, picture in picture additions, no less than 50 changes in total were added and then the movie saved to its original format to see how the drive handled the changes, Since memory and CPU are not a factor here as both are running the same, the time difference is the HDD's inability to keep up with the CPU and memory.
Here the Western Digital manages to spread its wings over the Momentus HDD and gain quite a good win. In the real world applications we see the Western Digital drive has its advantages.