Seagate Barracuda 2TB Surveillance Hard Drive - SATA 6Gb/s 64MB Cache 3.5-Inch Internal Drive (ST2000DM006)
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Amazon.com: Seagate BarraCuda Internal Hard Drive 4TB SATA 6Gb/s 128MB Cache 2.5-Inch 15mm (ST4000LM024) (Renewed),Mechanical Hard Disk : Electronics
Seagate BarraCuda XT ST32000641AS 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive - Newegg.com