Wondering about using a high capacity SD card for tracking. Solid state memory should read/write faster than a HD, though I do have a 7200rpm drive with a 8m cache (16?? not sure). I suppose this depends on bus speeds, etc, and where the SD is located in the physical (and virtual) hierarchy of the computer? SD cards are relatively inexpensive - I can get 2 4G cards for appx $30. Has anyone tried this? Anyhow, here's the question: - How can I test the data read/write speed of my actual, installed hardware? I could look at rated specs, but this does not account for my actual conditions.