Your CCTV NVR Has 32 Cameras Recording 24/7. The Drives Inside It Are Consumer-Grade. They Are Failing One at a Time.
Consumer hard drives are rated for 8 hours of operation per day, 240 power-on hours per year, and workloads measured in tens of terabytes. Surveillance NVRs run 24/7/365, write continuously at near-line-rate, and push 180 TB/year through each drive in a 32-camera deployment. The WD Purple Pro 18TB is an enterprise-class surveillance drive built for exactly this workload: 7,200 RPM, CMR recording, 550 TB/year workload rating, and AllFrame AI firmware that optimizes write patterns for 32 simultaneous HD streams without dropping frames. It is the drive that survives a 24/7 surveillance environment for five years without a single dropped frame or a single failed drive in the array.
المواصفات الفنية
| معامل | تخصيص |
|---|---|
| سعة | 18تيرابايت (also: 8تيرابايت, 10تيرابايت, 12تيرابايت, 14تيرابايت, 16تيرابايت, 20تيرابايت, 22TB in Purple Pro series) |
| عامل الشكل | 3.5-بوصة LFF |
| Interface | SATA 6Gb/s |
| سرعة الدوران | 7,200 RPM |
| Recording Technology | CMR (Conventional Magnetic Recording) — no SMR write penalty |
| Cache Buffer | 512 MB |
| Sustained Transfer Rate | يصل إلى 270 ميغابايت/ق |
| Average Latency | 4.16 ms |
| MTBF | 2,000,000 ساعات (enterprise-class, surveillance-optimized) |
| Workload Rate Limit | 550 TB/year (enterprise-class — 3x consumer drive workload rating) |
| AllFrame AI | Firmware-optimized ATA streaming command set: supports 64 HD cameras per drive, reduces frame loss, prioritizes write integrity over read caching |
| قوة (Idle / Operating / Standby) | 2.8دبليو / 6.5دبليو / 0.8دبليو |
| Sealing | Helium-sealed (ultrastar-derived HelioSeal technology) |
| Sector Size | 512ه (512-byte emulation) |
| Rotational Vibration | RV sensor array — compensates for multi-drive vibration in NVR chassis |
| Shock (Operating / Non-Op) | 30جي / 250جي (lower operating shock tolerance than enterprise drives — designed for stable NVR mounting) |
| Physical | 147.0 x 101.6 x 26.1 مم, 690g |
| Temperature | 0C to 65C |
| ضمان | 5-year limited (manufacturer), 3-year with WD Purple Pro registration |
Purple Pro vs Exos vs Red Pro — The WD Portfolio for Surveillance
| ميزة | Purple Pro 18TB | Exos X24 24TB | Red Pro 20TB |
|---|---|---|---|
| Designed for | 24/7 surveillance NVR, DVR, video analytics | Enterprise data center, rack servers | ناس, home/small office, غارة |
| Workload Rating | 550 TB/year | 550 TB/year | 300 TB/year |
| AllFrame AI | Yes — 64 cameras, streaming write optimization | لا | لا |
| RAID Support | Supported (NVR-specific RAID: غارة 5, غارة 6 recommended) | Full enterprise RAID (0/1/5/6/10/50/60) | غارة 0, 1, 5, 10 only (no 6/60) |
| Vibration Protection | RV sensor (multi-drive NVR optimized) | RV sensor (rack server optimized) | RV sensor (NAS optimized) |
| Best for | CCTV, access control, body-worn camera storage | الخوادم, سان, DAS, backup targets | NAS devices in climate-controlled environments |
Retention Math: How Many Days of 4K Video Fit on an 18TB Drive
| Camera Count | Resolution / Bitrate | Daily Storage Per Camera | Daily Total | Retention on 18TB (Single Drive) | Retention on 8x 18TB (غارة 5, 126TB Usable) |
|---|---|---|---|---|---|
| 32 cameras | 4K, 15fps, H.265, 8 Mbps | 86 غيغابايت | 2.75 تيرابايت | 6.5 days | 46 days |
| 64 cameras | 1080ص, 15fps, H.265, 4 Mbps | 43 غيغابايت | 2.75 تيرابايت | 6.5 days | 46 days |
| 128 cameras | 1080ص, 15fps, H.264, 8 Mbps | 86 غيغابايت | 11 تيرابايت | 1.6 days | 11.5 days |
A single 18TB Purple Pro delivers 6.5 days of retention for a 32-camera 4K NVR — typical for convenience stores, gas stations, and small retail. An 8-drive RAID 5 array delivers 46 days — appropriate for corporate campuses, warehouses, and mid-sized retail. Scale up deployment with additional NVRs or larger arrays for multi-site, casino, or city-wide surveillance requirements.
Compatible NVR Platforms
SATA 6Gb/s, compatible with any NVR or DVR with 3.5-inch SATA bays. Tested with Hikvision, Dahua, Axis, Milestone, Genetec, and ExacqVision NVR platforms. Supports WDDA (Western Digital Device Analytics) for predictive drive health monitoring in supported NVR software.
Source Through Xincuan
We supply WD Purple Pro drives for surveillance deployments with factory-direct pricing, 3-year warranty, and global shipping. Volume pricing for 20+ محركات.
