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Alternatively, you can also buy your drives a few months apart to get different batches, most likely.

Yeah, that's an option; though since my pair failed at once, I need to buy at least two immediately to get the mirror back up.

Because of this, I always buy a different brand as well.

Any limitations, or am I good so long as they're the same label capacity? I assume I just lose a few MB or so from whichever is a little larger?