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Well now you are assuming the documentation is telling the truth. The reality is, things still don't go to disk as often as you think.

http://aphyr.com/posts/284-call-me-maybe-mongodb

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Unacknowledged writes are disturbing but this can happen in any system: data hits the disk, and just before the server can send an ack to the client, it crashes.

That same blog notes Postgres is susceptible to the same issue: http://aphyr.com/posts/282-call-me-maybe-postgres

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