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2TB My Passport External Portable Hard Disk Drive USB 3.0 - WDBYVG0020BBK 2 TB

Western Digital Purple 6TB 3.5'' Surveillance Hard Drive, SATA 6 Gb/s, 256MB Cache Size, 5400 Rpm, CMR Recording Technology, Built to Handle Up to 64 Cameras Per Drive WD64PURZ

Western Digital 4TB Purple SATA Surveillance Hard Drive, Up to 175 MB/s Transfer Rate, 128 MB Cache Size, CMR Recording Technology WD44PURZ

My Passport Portable External Hard Drive, USB 3.0 With Automatic Backup and Software Protection (WDBPKJ0040BBK-WESN) Compatible With PC, PS4 4 TB