Built for Surveillance, Not General Storage
The HDD-4000 is a 4TB surveillance hard drive for CCTV recorders (NVRs and DVRs).
Surveillance drives are built to record all day, every day, from several cameras at once. A normal desktop drive isn't designed for that and tends to fail early. They also run cooler and quieter.
4TB is the most popular size for homes and small businesses. As a rough guide, it gives around 14 to 28 days of continuous recording from a 4 camera system, or 10 to 16 days from 8 cameras at 1080p recording on motion.
It fits the standard 3.5 inch bay in most recorders. Check your recorder's maximum drive size before ordering, and make sure the drive is screwed in firmly, as vibration shortens its life.