HDD drives such as this one tend to be cheaper than an SSD drive, but they're not as fast. Potentially a perfect choice if you happen to be looking for an HDD drive.
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Seagate SkyHawk Surveillance ST6000VX001 6TB 3.5" 5900RPM 256mb Cache SATA III Internal Hard Drive
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6TB - Seagate SkyHawk Surveillance Hard Drive
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Seagate SkyHawk Surveillance ST6000VX001 6TB 3.5" 5900RPM 256mb Cache SATA III Internal Hard Drive