![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](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
WD Black Performance Hard Drive WD4003FZEX - hard drive - 4 TB - SATA 6Gb/s - WD4003FZEX - Internal Hard Drives - CDW.com
![Western Digital WD 6TB Surveillance Internal Hard Drive Disk 3.5" 64M Cache SATA III 6Gb/s 6T HDD HD Harddisk for CCTV DVR NVR - AliExpress Western Digital WD 6TB Surveillance Internal Hard Drive Disk 3.5" 64M Cache SATA III 6Gb/s 6T HDD HD Harddisk for CCTV DVR NVR - AliExpress](https://ae01.alicdn.com/kf/Sf00a2b71e77b42d1ac5ecda221e664bfc.jpg)