The article does not include the most critical detail: the speed!<p>Edit: I have watched the video so you don't have to (although if you don't watch it you'll miss all the bubbles).<p>Total volume size: 10.4MB<p>Small file: 220kB/s
"Large" file: also 220k/s
Installing chess: 1MB/s<p>That said, he's getting the speed from Activity Monitor which seems like an odd choice. I would have preferred the more obvious one of writing a fixed amount of data and dividing that by the time taken.