While the ST910021AS average transfer rate falls a bit shy of the claimed speed, the peak is actually a little higher. The graph shows that as the drive heads move towards the inner sectors of the spindle the speed begins to drop off. The result is just under 40MB/s average and over 15ms access time.
The TS32G SSD drive average speed is much less, but maintains an almost constant 24-25MB/s throughout the test. Also the access time is phenomenal, less than 3ms. Note that there was zero CPU utilization recorded, something I've never seen before with a traditional hard drive.
HD Tach shows similar results, with a nearly identical 25.2MB/s average read and just 2.9ms access time. Again, CPU utilization shows as a low 1%.
SiSoft Sandra turns in nearly identical figures, with a 24.9MB/s read performance and 11.6MB/s write.
In the latency test, access time is listed at just 2ms.
Now let's compare these benchmark results to a real world OS install.