Bandwidth != Latency
That graph seems to be using "bandwidth" as a proxy for latency, when they're not the same thing.
For example, it shows disk in the "10-100MB/sec" range, and tape in the "1-10MB/sec" range. In reality a modern tape drive has higher bandwidth than a spinning disk (LTO6 160MB/sec, LTO7 300MB/sec, both uncompressed rates). The difference is whether you want to wait 10ms to retrieve your data, or 10 seconds.
Still, makes for a satisfyingly linear picture.
