SSDs are a possibility, but they're much more expensive (if you're talking about the decent kind that can actually handle random writes), and there's no reason to think they'd fail less often than Raptors under this kind of load. And we don't need the performance, Raptors are fine for us in that respect. So we have no real reason to try them. It's a possibility for the future when the price comes down, of course.
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