1. 4x 2.5" Hot-swap SAS3/SATA3 HDDs
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2. Overheat LED indication
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3. Drive Activity/Failure LED
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4. 1x 5.25" Drive Bay Enclosure
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5. 4x SATA HDD Connectors, up to 12Gbs support
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6. 4cm Cooling Fan 12.5K RPM 16 CFM