I suspect other memory like those found in USB flash drives could also be the slowest weakest link if they are the cheap kind. So once again USB 2.0 maxes out at 40 MB/s and slows down from the next weakest link at which is the 25 MB/s HDD should it get filled up. I know the 500 GB drive is not the bottleneck since it has read/write speeds of 70 MB/s if it was attached to a USB 3.0 port on a newer Macbook. I also did the above test with a regular spinning 2.5" Laptop 500 GB Toshiba HDD as the external drive inside the USB 3.0 Nexstar CX External Enclosure and it starts off with write speeds of 40 MB/s, but as the 500 GB gets filled up it gets slower effective rpm near the centre of the hdd disc and it slows down to 25 MB/s.
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