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Any SATA HD will work but I recommend 7200 RPM drives by HGST: https://www.amazon.com/HGST-Deskstar-3-5-Inch-Internal-0S03664/dp/B00HHAJU7K/ref=sr_1_1?ie=UTF8&qid=1483314069&sr=8-1&keywords=hgst&th=1
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