How to optimize Disk Activity for ClearOS?

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http://serverfault.com – I am looking for advice on how to optimize a ClearOS Enterprise 5.2 (+) install for disk i/o. For example, I installed my ClearOS on a thumb drive. I am seeing that the thumb drive flashes a LOT (disk activity). Maybe it's logging settings, or filesystem settings, both, or ? (HowTos)