WD Purple™ Pro Smart Video Hard Drive
The WD Purple™ Pro HDD, with OptiNAND™ technology in 22TB1, delivers big capacity in a drive engineered for advanced, AI-enabled, always-on smart video recorders, appliances, and servers.
Western Digital's exclusive AllFrame™ AI technology improves ATA streaming to help reduce frame loss and improve overall video playback.
WD Purple™ Pro drives are optimized to handle up to 64 single-stream HD cameras2 as well as many of the latest smart cameras that transmit multiple streams.
With a workload rating up to 550TB/year3, these drives are built to keep up with heavy video data capture and analysis.
The reliable WD Purple™ Pro is engineered with an MTBF of up to 2.5 million hours4 for advanced smart video solutions that operate in 24/7 environments.
Western Digital Device Analytics™ provides a wealth of storage device parametric operational and diagnostic data to compatible systems.
TECHNICAL SPECIFICATIONS

Product Specifications
Model number WD221PURP
Interface SATA 6 Gb/s
Formatted capacity 22TB
Form factor 3.5-inch
Advanced Format (AF) Yes
Recording Technology CMR
RoHS compliant Yes
Product Features
Maximum drive bays supported No Limit
Camera Support Up to 64 HD
AI Streams 32
Firmware Feature Name AllFrame AI
Tarnish resistant components Yes
Performance
Interface transfer rate (max) Buffer to host 6 Gb/s
Interface transfer rate (max) Host to / from drive 265 MB/s
Cache (MB) 512 MB
RPM 7200
Reliability/Data Integrity
Load/unload cycles 600 000
Annualized Workload Rate(TB/year) Up to 550 TB/year
MTBF (hours) 2 500 000
Limited warranty (years) 5 years
Physical Dimensions
Height (max) (in / mm) 1.028 / 26.1
Length (max) (in / mm) 5.787 / 147
Width (± .01 in.) (in / mm) 4 / 101.6
Weight (± 3% ) (lb / kg) 1.48 / 0.67