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 | WD64PURZ758.99
LaCie 1Big Dock 4TB External HDD, 7200 RPM, Up to 280 MB/s Data Transfer Speed, Up to 70W Charging Power, USB / USB 3.0 / Thunderbolt Interface, Windows & Mac Compatible, Black | STHS40008001454.25
Seagate Expansion Portable 2TB External Hard Drive HDD - 2.5 Inch USB 3.0, for Mac and PC with Rescue Services.420.00