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Seagate Barracuda ST4000DM004 - HDD - 4 TB - Internal - 3.5" - SATA 6Gb/s - 5400 RPM - Buffer: 256 MB
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MaxDigitalData 4TB 64MB Cache 7200PM SATA 6.0Gb/s 3.5" Internal Surveillance CCTV DVR Hard Drive (MD4000GSA6472DVR) - w/ 2 Year Warranty : Amazon.co.uk: Computers & Accessories
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Toshiba X300 4TB Performance & Gaming 3.5-Inch Internal Hard Drive – CMR SATA 6 GB/s 7200 RPM 256 MB Cache - HDWR440XZSTA
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