For sale: Internal hard drive specifically for surveillance camera systems and DVR/NVR devices. The units are in excellent condition (like new) and have been used minimally. Specifications: Company: Western Digital (WD). Series: Purple (WD Purple) - designed for 24/7 continuous operation. Capacity: 4 Terabytes (4TB). Model: WD40PURX (64MB Cache). Condition and Warranty: The hard drive is very clean, guaranteed and free of any issues or noises. Warranty: I will give the buyer a (full month) warranty to test the hard drive and ensure its complete safety. Location: Jeddah (hand delivery). Two units are available, very clean usage. Reason for selling: I upgraded from 4TB to 8TB.