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Toshiba 4TB S300 Surveillance HDD - 3.5' SATA Internal Hard Drive Supports up to 64 HD cameras at a 180TB/Year workload (HDWT720UZSVA) : Amazon.co.uk: Computers & Accessories
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Seagate ST4000VX000 Surveillance 4 TB Internal Hard Drive - Black: Amazon.co.uk: Computers & Accessories
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