Hi, I am A. Stevens here to help with your question!
David - I think you are on the right track with the WD Elements Desktop Hard Drive - it would be perfectly suitable for you what you are wanting to do.
It has support for both USB 2.0 and 3.0 - your recorder uses USB 2.0 - so it would work perfectly fine.
Please let me know if you have some additional questions regarding this, and I would be happy to answer them.
Otherwise, please do rate my answer with the smiley faces below, I would greatly appreciate it.
Many thanks for quick and efficient reply