Western Digital 4 TB Purple Surveillance 3.5" Internal Hard Disk Drive

Surveillance HDD 24/7 Continuous Recording Up to 64 HD Cameras Purpose-built for 24/7 video surveillance recording — engineered to handle the continuous write workloads, heat fluctuations, and vibrations of NVR and DVR environments that standard desktop drives cannot sustain. The WD Purple 4TB (WD43PURZ) is a 3.5-inch SATA hard drive designed exclusively for video surveillance systems. Unlike standard desktop hard drives built for intermittent use, the WD Purple is rated for continuous 24/7 operation at up to 180 TB/year workload — the sustained write-intensive environment of security cameras recording around the clock. It supports up to 64 single-stream HD cameras, is compatible with DVR and NVR systems from major security brands, and features WD's exclusive AllFrame technology to minimize video frame loss during playback. Available at ITFactory.ca — Canada's trusted source for storage and security system components. Why You Cannot Use a Desktop Hard Drive in a Surveillance System Standard desktop hard drives are designed for short, intermittent read/write sessions — web browsing, document editing, and occasional file transfers. A surveillance system writes video data continuously, 24 hours a day, 7 days a week, often from multiple cameras simultaneously. A desktop drive used in this environment will typically fail within months due to heat buildup, vibration stress from nearby drives in multi-bay NVRs, and workload rates it was never designed to handle. The WD Purple is purpose-engineered for exactly this workload — rated for 180 TB/year of continuous write activity, thermally optimized for always-on NVR environments, and tested for compatibility with security system hardware from Hikvision, Dahua, and other major brands. Key Features Designed for 24/7 Continuous Operation Engineered to run continuously without the thermal and mechanical stress that causes standard desktop drives to fail under surveillance workloads. Tested to sustain always-on recording across multi-camera security installations. AllFrame Technology WD's exclusive AllFrame technology enhances ATA streaming to reduce video frame loss and improve overall playback quality. Ensures that surveillance footage is recorded and retrieved cleanly — critical for reviewing incidents where missing frames could matter. Up to 64 Single-Stream HD Cameras Supports simultaneous recording from up to 64 single-stream HD cameras — suitable for small commercial premises, multi-room residential systems, and mid-scale business security installations. 180 TB/Year Workload Rating Rated for up to 180 TB of data written per year — significantly higher than desktop drives. This covers continuous multi-camera HD recording without exceeding the drive's designed operational limits. Thermal and Vibration Tolerance Engineered to handle the elevated heat fluctuations and mechanical vibrations common in multi-drive NVR enclosures — environments where standard desktop drives are not designed to operate reliably. CMR (Conventional Magnetic Recording) Uses CMR recording technology — the same reliable method used in enterprise storage — ensuring full read/write compatibility and predictable, consistent performance in surveillance systems that require stable write speeds. Broad Compatibility with Security Systems Tested for seamless integration with DVR and NVR systems from major security brands including Hikvision, Dahua, Bosch, and others. Plug-in-and-record setup without complex configuration. Up to 8 Drive Bay Support The 4TB WD Purple supports installation in systems with up to 8 drive bays — covering the majority of small and mid-scale NVR enclosures used in residential and small commercial security installations. 3-Year Limited Warranty Backed by Western Digital's 3-year limited warranty, providing confidence in long-term reliability for always-on surveillance deployments. SATA 6 Gb/s Interface Uses the standard SATA 6 Gb/s interface — universally compatible with virtually all DVR, NVR, and desktop security system enclosures without any adapters or specialized hardware. Who Is This For? The WD Purple 4TB is the right choice for anyone installing or upgrading storage in a DVR or NVR-based security system. It offers a strong balance of capacity and cost — suitable for home and small business installations where longer footage retention or more cameras require more than 1TB, without stepping up to the higher cost of enterprise-tier drives. Home security camera systems Small business DVR and NVR installs Security system integrators and installers Retail, office, and warehouse surveillance Replacement drives for existing NVR systems Technical Specifications Brand Western Digital (WD) Model WD Purple Surveillance Hard Drive Part Number WD43PURZ Drive Type HDD (Hard Disk Drive) — 3.5 inch Capacity 4TB Interface SATA 6 Gb/s Rotation Speed 5400 RPM Cache 256 MB Recording Technology CMR (Conventional Magnetic Recording) Max Sequential Read Up to 110 MB/s Workload Rating Up to 180 TB/year Camera Support Up to 64 single-stream HD cameras Drive Bay Support Up to 16 bays Surveillance Technology WD AllFrame technology Compatible Systems DVR, NVR — compatible with Hikvision, Dahua, and major security brands Operating Temperature 0°C to 65°C Warranty 3-year limited warranty Sold by ITFactory.ca — Canadian authorized WD reseller Why Buy from ITFactory.ca? ITFactory.ca is a trusted Canadian retailer for storage and security system components, serving installers, businesses, and homeowners across the country. Every product we sell is genuine and backed by our team. → Authorized Canadian WD reseller → Genuine WD product with warranty → Fast shipping across Canada → Business invoicing available → Larger capacities also available → Bilingual customer support Frequently Asked Questions Can I use a regular desktop hard drive in my NVR or DVR instead? Using a standard desktop hard drive in a surveillance system is not recommended. Desktop drives are designed for short, intermittent read/write sessions — not continuous 24/7 writing from multiple cameras. Under surveillance workloads, desktop drives typically fail much earlier due to heat buildup, vibration stress from adjacent drives in multi-bay enclosures, and workload rates that far exceed their design specifications. The WD Purple is purpose-built and rated for 180 TB/year of continuous write activity — the WD43PURZ also carries a 3-year warranty that covers this use case, which standard desktop drive warranties typically do not. How many days of footage will 4TB store? Recording duration depends on the number of cameras, video resolution, frame rate, and compression format used by your DVR or NVR. As a general estimate: a single 1080p HD camera recording continuously at standard H.264 compression uses approximately 10–15 GB per day. At that rate, 4TB provides roughly 270–400 days of footage from one camera. With multiple cameras, storage is divided proportionally — four cameras would reduce retention to approximately 65–100 days, and eight cameras to approximately 33–50 days. Most modern NVRs display estimated recording time based on your camera count and settings. For longer retention or higher camera counts, higher-capacity WD Purple drives are also available at ITFactory.ca. Is the WD Purple compatible with Hikvision and Dahua NVRs? Yes. WD Purple drives are tested for compatibility with a wide range of DVR and NVR systems from major security brands including Hikvision and Dahua. The WD43PURZ uses a standard SATA 6 Gb/s interface, which is universally compatible with virtually all DVR and NVR enclosures without any adapters or special configuration. What is AllFrame technology? AllFrame is WD's proprietary technology that enhances ATA streaming in surveillance drives. It reduces the occurrence of video frame drops during continuous write workloads — meaning your recorded footage has fewer gaps, glitches, or corrupted segments when compared to standard drives used in the same environment. This is particularly important for incident review, where missing frames can affect the usefulness of recorded footage. What is the difference between WD Purple and WD Purple Pro? WD Purple is designed for mainstream surveillance with up to 64 cameras and a 180 TB/year workload rating — suitable for most home and small business security systems. WD Purple Pro is built for larger, more demanding installations with 32 to 64 channel NVR systems, AI-enabled cameras, and 4K recording. The Pro model carries a 550 TB/year workload rating and is rated for up to 32 drive bays. If you are running a large commercial system with AI video analytics or high-channel-count recording, the Pro is the appropriate choice.