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My guess is that for the hard-to-see zig-zag line, the x-axis represents disk addresses from 0% (beginning of the disk) to 100% (last block on the disk), not time. The y-axis for that line is on the right, in milliseconds. It seems to be a continuous trace of (%-of-disk, seek time) points, all linked together in a chain, chronologically.
This contrasts with the left-hand y-axis which is in MB/s and applies to the blue line across the top. I agree that the x-axis percentages in that case refer to time: the percent of the test period for each point. Rather odd, I agree.
The data points for the most recent benchmark of each disk are cached in ~/.cache/
The text should explain this, and in addition, the axes should use the same color as the lines.
My other suggestion is to change the colors used for the zig-zag line. I'm red-green colorblind and find it nearly impossible to see them.
Note: I also wish those benchmarks were archived, not just cached. See a related request for that at
"How can I log my SSD's read performance over time? - Ask Ubuntu - Stack Exchange"
http://
Note also that the name of the gnome-disk-utility executable is "palimpsest".