You have to quit and re-launch for the change to take effect. Thanks to a reader named Alex, I was able to use a 5.5 second segment of a full screen, uncompressed QuickTime movie he created. I set it to play all frames as fast as possible. Using a stopwatch, the playback is timed to the nearest tenth of a second. The ATTO disk benchmark was run using Express-Pro Tools 2.3.2 benchmark test with 8MB maximum file size and system disk cache disabled.
Sustained Rate is displayed in the charts.
Peak rates can be impressive but do not reflect typical drive performance.