As camera counts grow, or clients want a longer buffer before old footage gets overwritten, storage capacity becomes the limiting factor faster than most people expect — a 2TB drive that comfortably holds a week or two of footage at 4 cameras can fill up in days once a system grows to 8 or more. The WD Purple 4TB carries the same surveillance-tuned firmware and reliability engineering as its 2TB sibling, built for continuous multi-stream write workloads around the clock, but roughly doubles the available recording window before older footage needs to cycle out. It’s the natural mid-tier recommendation for growing systems: enough headroom for most residential and small commercial installs (typically 4–8 cameras) to retain 2–4 weeks of footage comfortably, which is often the minimum retention period clients want for insurance or dispute-resolution purposes. Recommend this over the 2TB model any time a client mentions wanting “more than a week or two” of footage history, or whenever the camera count on a quote reaches the mid-single digits and up.
Key Features:
- 4TB capacity, surveillance-tuned firmware
- Built for continuous 24/7 multi-camera recording
- 3.5″ SATA 6Gb/s, 64MB cache
- Roughly double the retention window of the 2TB model
- Compatible with most major DVR/NVR brands
- Recommended for 4–8 camera installations
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