WD Purple® Hard Drives

The Right Drive for Smart Video Surveillance
WD Purple® drives are designed to meet the challenges of 24×7 video surveillance
recording. These drives are engineered specifically for surveillance to help withstand
the elevated heat fluctuations and equipment vibrations within NVR environments. An
average desktop drive is built to run for only short intervals, not the harsh 24/7 always
on environment of a high-definition surveillance system. With WD Purple drives, you
get reliable, surveillance-class storage that’s tested for compatibility in a wide range
of security systems. Exclusive WD AllFrame™ technology helps reduce frame loss and
improve overall video playback.
Industry-Leading Storage. Surveillance You Can Trust.
Western Digital has provided surveillance-grade storage for more than a decade. With
WD Purple® surveillance storage, drives are engineered for high temperature, always
on surveillance systems so you can rely on quality video when you need it most. WD
Purple delivers smart video storage that you can trust and are backed by a 3-year limited
warranty9.
Western Digital’s Exclusive WD AllFrame™ Technology
All WD Purple® drives are equipped with AllFrame™ technology, which helps reduce
video frame drops and improves video recording and playback.
Enhanced Workload Ratings
WD Purple® drives feature a workload rating of up to 180TB/year⁷ – up to three times that
of desktop drives – to handle the unique demands of mainstream video surveillance DVR
and NVR systems.
Multiple Cameras, Multiple Streams
Modern recorders now support multiple video streams per camera. WD Purple® drives
support up to 64 single-stream HD cameras. Modern recorders now support multiple
video streams per camera. Select WD Purple® drives support up to 64 single-stream HD
cameras3. With so many options, you have the flexibility to upgrade or expand your
security applications in the future.
Designed for Reliable Operation
Engineered for reliability with an MTBF of up to 1 million hours8 and backed with a 3-year
limited warranty9, WD Purple® drives feature tarnish-resistant components11 and support
for storage systems with up to 16 drive bays12. WD Purple® hard drives are designed with
RAID error recovery control to help reduce failures in supported video recorders.
Wide Compatibility. Seamless Integration.
WD Purple® hard drives are built with compatibility in mind, so you can quickly and
seamlessly add capacity to your surveillance system. With a wide range of industry
leading enclosures and chipsets supported, you’re sure to find the DVR or NVR
configuration that’s right for you.
Three-Year Limited Warranty
As an industry-leading hard drive manufacturer, Western Digital stands behind their
surveillance storage solutions with a 3-year limited warranty9 included with every WD
Purple® drive.

Specifications
SURVEILLANCE HARD DRIVE
8TB 6TB 4TB 3TB 2TB 1TB
Model Number WD85PURZ WD64PURZ WD43PURZ WD33PURZ WD23PURZ WD11PURZ
Formatted capacity1 8TB 6TB 4TB 3TB 2TB 1TB
Form factor 3.5-inch 3.5-inch 3.5-inch 3.5-inch 3.5-inch 3.5-inch
Advanced Format (AF) Yes Yes Yes Yes Yes Yes
Recording Technology CMR CMR CMR CMR CMR CMR
Interface SATA 6Gb/s SATA 6Gb/s SATA 6Gb/s SATA 6Gb/s SATA 6Gb/s SATA 6Gb/s
RoHS compliant2 Yes Yes Yes Yes Yes Yes
Product Features
Cameras supported³ Up to 64 HD Up to 64 HD Up to 64 HD Up to 64 HD Up to 64 HD Up to 64
Maximum Drive Bays Supported 16 16 16 16 8 8
Firmware Feature Name AllFrame AllFrame AllFrame AllFrame AllFrame AllFrame
Tarnish resistant components Yes Yes Yes Yes No No
RV Sensors Yes Yes Yes Yes No No
Performance
Interface transfer rate (max)⁴
Buffer to host
Host to/from drive (sustained)5
6 Gb/s
215 MB/s
6 Gb/s
180MB/s
6 Gb/s
180MB/s
6 Gb/s
180MB/s
6 Gb/s
180MB/s
6 Gb/s
180MB/s
Cache (MB)¹ 256 256 256 256 64 64
Reliability/Data Integrity
Load/unload cycles⁶ 300,000 300,000 300,000 300,000 300,000 300,000
Annualized workload rating⁷ 180TB/yr 180TB/yr 180TB/yr 180TB/yr 180TB/yr 180TB/yr
Non-recoverable read errors per bits read <1 in 10^14 <1 in 10^14 <1 in 10^14 <1 in 10^14 <1 in 10^14 <1 in 10^14
MTBF8 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000
Limited warranty (years)9 3 3 3 3 3 3
Power Management10
Average power requirements (W)
Read/Write
Idle
Standby and Sleep
5.3
4.7
0.4
4.7
4.3
0.3
4.7
4.3
0.3
4.6
3.7
0.3
3.8
3.2
0.3
3.8
3.2
0.3
Environmental Specifications
Temperature (°C, on the base casting)
Operating
Non-operating
0 to 65-40 to 70
0 to 65-40 to 70
0 to 65-40 to 70
0 to 65-40 to 70
0 to 65-40 to 70
0 to 65-40 to 70
Shock (Gs)
Operating (2 ms, read/write)
Operating (2 ms, read)
Non-operating (2 ms)
70
70
250
30
65
250
30
65
250
30
65
250
30
65
250
30
65
250
Acoustics (dBA)
Idle
Seek (average)
24
28
23
27
23
27
23
27
21
26
21
26
Physical Dimensions
Height (in./mm, max) 1.028/26.1 1.028/26.1 1.028/26.1 1.028/26.1 1.028/26.1 1.028/26.1
Length (in./mm, max) 5.787/147 5.787/147 5.787/147 5.787/147 5.787/147 5.787/147
Width (in./mm, ± .01 in.) 4/101.6 4/101.6 4/101.6 4/101.6 4/101.6 4/101.6
Weight (lb/kg, ± 3%) 1.58/0.72 1.26/0.57 1.26/0.57 1.26/0.57 0.99/0.45 0.99/0.45
1 1MB = 1 million bytes, 1GB = 1 billion bytes, and 1TB = 1 trillion bytes. Actual user capacity may be less depending on operating
environment.
2 This drive is in compliance with the European Union Directive 2011/65/EU and Directive (EU) 2015/863 on the restriction of the use of
certain hazardous substances in electrical and electronic equipment.
3 Single stream at 3.2Mbps (1080p, H.265, 25 fps). Results may vary depending on camera resolution, file format, frames per second,
software, system settings, video quality, and other factors.
⁴ Gigabit per second (Gb/s) = one billion bits per second. Effective maximum SATA 6 Gb/s transfer rate calculated according to the Serial
ATA specification published by the SATA-IO organization as of the date of this specification sheet. Visit www.sata-io.org for details.
⁵ 1 MB/s = 1 million bytes per second. Based on internal testing; performance may vary depending upon host device, usage conditions,
drive capacity, and other factors.
⁶ Controlled unload at ambient condition.
⁷ Workload Rate is defined as the amount of user data transferred to or from the hard drive. Workload Rate is annualized (TB transferred x
(8760 / recorded power-on hours)). Workload Rate will vary depending on your hardware and software components and configurations.
⁸ MTBF specifications are based on a sample population and are estimated by statistical measurements and acceleration algorithms under
typical operating conditions: workload of 90TB/year and drive temperature of 40°C. Derating of MTBF will occur above these parameters,
up to 65°C drive temperature. MTBF does not predict an individual drive’s reliability and does not constitute a warranty.
⁹ See http://support.wdc.com/warranty for regional specific warranty details.
10 Power measurements at room-ambient temperature.
11 Tarnish resistant components for capacities 3TB and higher.
12 1TB through 2TB support up to eight bays; 3TB and above support up to 16 bays.
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