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Amazon.com: Western Digital 2TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 64 MB Cache, 3.5" - WD20PURZ : Electronics
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![Amazon.com: Western Digital RE4 WD1003FBYX 1TB 7200RPM 64MB Cache SATA 3.0Gb/s 3.5in (Enterprise Grade) Internal Hard Drive - [Renewed] w/ 1 Year Warranty : Electronics](https://m.media-amazon.com/images/I/61BAltI5GIL._AC_UF894,1000_QL80_.jpg "Amazon.com: Western Digital RE4 WD1003FBYX 1TB 7200RPM 64MB Cache SATA 3.0Gb/s 3.5in (Enterprise Grade) Internal Hard Drive - [Renewed] w/ 1 Year Warranty : Electronics")
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![Amazon.com: Western Digital Purple 3TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6 Gb/s 64MB Cache 3.5 Inch - WD30PURX [Old Version] : Electronics](https://m.media-amazon.com/images/I/81fWDTJVIPL._AC_UF894,1000_QL80_.jpg "Amazon.com: Western Digital Purple 3TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6 Gb/s 64MB Cache 3.5 Inch - WD30PURX [Old Version] : Electronics")
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