Hi,
I have two TOSHIBA MG09ACA18TE. Let's call them "Son" and "Don". I may keep one and return the other one.
What is your advice? Which one shall I keep, which one return? And for what reason?
The HDDScan graphs are attached.
Thanks in advance!

Keep them both, put them in raid 1. As with all He drives when it dies you're going to struggle to get help recovering it. I still don't understand why people feel the need to use such large capacity single devices.

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Please give further details about them.

For example, are both HDDs exactly the same model (i.e., TOSHIBA MG09ACA18TE)?

Are both new?

If the reply to both questions is yes, then it does not matter which you choose to return. Because, they are totally identical.

Even if they not are exactly the same model, they are surely very similar, And therefore, it doesn't matter much which one you're going to return.

They are both identical and new.
I was asking because I've been a little concerned about this steep decline portion at the inner sectors of "Son". Also, I've never seen such a "threshold" in speed as "Don's" test displays between LBA 5 and 7.5 million.