WD Blue WD20SPZX - Hard drive - 2 TB - internal - 2.5-inch - SATA 6Gb/s - 5400 rpm - buffer: 128 MB | Dell USA
![Amazon.com: WD Purple 1TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6 Gb/s 64MB Cache 3.5 Inch - WD10PURX [Old Version] : Electronics](https://m.media-amazon.com/images/I/819Pbam+KHL.jpg "Amazon.com: WD Purple 1TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6 Gb/s 64MB Cache 3.5 Inch - WD10PURX [Old Version] : Electronics")
Amazon.com: WD Purple 1TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6 Gb/s 64MB Cache 3.5 Inch - WD10PURX [Old Version] : Electronics
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Amazon.com: Western Digital 4TB WD Blue PC Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, 256 MB Cache, 3.5" - WD40EZAZ : Electronics
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Amazon.com: Western Digital 3TB WD Red Plus NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, CMR, 128 MB Cache, 3.5" -WD30EFZX : Electronics
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Amazon.com: WD Blue 1TB Mobile Hard Disk Drive - 5400 RPM SATA 6 Gb/s 9.5 MM 2.5 Inch - WD10JPVX : Electronics
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Mixing 7,200rpm and 5,400rpm "Green" hard drives in RAID 0
