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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.

技術仕様

パラメータ	仕様
容量	18結核 (また: 8結核, 10結核, 12結核, 14結核, 16結核, 20結核, 22TB in Purple Pro series)
フォームファクタ	3.5-インチ LFF
インタフェース	SATA 6Gb/秒
回転速度	7,200 RPM
Recording Technology	CMR (Conventional Magnetic Recording) — no SMR write penalty
Cache Buffer	512 MB
Sustained Transfer Rate	まで 270 MB/s
Average Latency	4.16 ms
MTBF	2,000,000 時間 (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
力 (アイドル状態 / オペレーティング / Standby)	2.8W / 6.5W / 0.8W
Sealing	Helium-sealed (ultrastar-derived HelioSeal technology)
セクタサイズ	512e (512-byte emulation)
Rotational Vibration	RV sensor array — compensates for multi-drive vibration in NVR chassis
ショック (オペレーティング / Non-Op)	30G / 250G (lower operating shock tolerance than enterprise drives — designed for stable NVR mounting)
物理的な	147.0 バツ 101.6 バツ 26.1 んん, 690g
温度	0C to 65C
保証	5-年限定 (メーカー), 3-year with WD Purple Pro registration

Purple Pro vs Exos vs Red Pro — The WD Portfolio for Surveillance

特徴	Purple Pro 18TB	Exos X24 24TB	Red Pro 20TB
のために設計されています	24/7 surveillance NVR, DVR, video analytics	Enterprise data center, rack servers	NAS, home/small office, レイド
Workload Rating	550 TB/year	550 TB/year	300 TB/year
AllFrame AI	Yes — 64 cameras, streaming write optimization	いいえ	いいえ
RAID サポート	サポートされています (NVR-specific RAID: レイド 5, レイド 6 recommended)	Full enterprise RAID (0/1/5/6/10/50/60)	レイド 0, 1, 5, 10 のみ (いいえ 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	サーバー, さん, ザ, 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 (レイド 5, 126TB Usable)
32 cameras	4K, 15fps, H.265, 8 Mbps	86 GB	2.75 結核	6.5 days	46 days
64 cameras	1080p, 15fps, H.265, 4 Mbps	43 GB	2.75 結核	6.5 days	46 days
128 cameras	1080p, 15fps, H.264, 8 Mbps	86 GB	11 結核	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/秒, 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.