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Synology 4TB HAT5300 SATA III 3.5" Internal Enterprise
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BarraCuda 4TB 2.5" Internal Laptop Hard Drive, 5400 RPM, SATA 6Gb/s, Up to 140MB/s Data Transfer Rat ST4000LM024
WD Blue 4TB Hard Drive Review: A Decent Hard Drive That Won't Break the Bank