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Description
WD Purple WD42PURZ 4TB 3.5" 5400RPM 256MB Cache SATA III Surveillance Internal Hard DriveUncompromising Storage with a WD Purple Surveillance Hard Drive WD Purple 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, you get reliable, surveillance class storage thats tested for
Uncompromising Storage with a WD Purple Surveillance Hard DriveWD Purple 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, you get reliable, surveillance-class storage that’s tested for compatibility in a wide range of security systems, and some of our latest models (WD22PURZ, WD42PURZ, and WD63PURZ) have improved power efficiency. Exclusive AllFrame™ technology helps reduce frame loss and improve overall video playback.
Western Digital's Exclusive AllFrame Technology
All WD Purple drives are equipped with AllFrame technology, which improves ATA streaming to help reduce frame loss and improve overall video playback, within a multitude of security video solutions.
Enhanced Workload Ratings
WD Purple™ drives feature a workload rating of up to 180TB/year2 - 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 (6TB1 and above), and can also support many of the latest cameras that transmit multiple streams to enable basic AI functionality. With so many options, you have the flexibility to upgrade or expand your security applications in the future.
Designed for Today's and Tomorrow's Surveillance Solutions
With an MTBF of up to 1 million hours3, WD Purple drives are engineered for mainstream surveillance DVRs and NVRs that operate 24/7. With tarnish-resistant components3 and support for more than eight bays4, WD Purple drives deliver reliable operation even in harsh environments.
Proactive Storage Management with WDDA
Western Digital Device Analytics™ (WDDA) provides a wealth of storage device parametric operational and diagnostic data to the system; algorithms interpret the data and direct the system to alert system administrators of specific recommended actions to address potential issues. WDDA is intended to empower OEMs, system integrators, and IT professionals to better monitor and proactively manage supported storage devices to maintain optimal operation.
Three-Year Limited Warranty
As an industry-leading hard drive manufacturer, Western Digital stands behind their surveillance storage solutions with a 3-year limited warranty included with every WD Purple drive.
Model
WD Purple
WD42PURZ
Capacity
4TB
Interface
SATA III
Cache
256MB
Data Transfer
SATA III: 6.0 Gbit/s
Recording Technology
CMR
Dimensions (L x W x H)
147mm x 101.6mm x 26.1mm
Physical Drive Size
3.5"
Packaging
OEM anti-static bag
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4.7 ★★★★★
Based on 25 reviews
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Product Reviews
★★★★★ 4
Interesting connections made.
Format: Paperback
I bought this because or had been referred to in several other excellent books I've read. Very scholarly and good case made but a bit dry and overdone/redundant at times when making a point. And if you've studied a lot, nothing really new revealed- but if just starting down this road, some great comparisons made.
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Reviewed in the United States on August 19, 2025
★★★★★ 5
Seminal
Format: Paperback
As many have noted, Hamlet's Mill is not an "easy" read, but it is an absolutely worthwhile experience not only to read but to re-read this seminal thesis on the transmission of ancient astronomical knowledge through mythology and legend. Perhaps the fact that a reader must wrestle with this text is part of the reason that it has generated so many fruitful inquiries and theories by later authors. The entire book is rich with ideas, many of which the authors drop and then pick up again and again later in the text, some of which are simply left for later analysts to pursue further on their own. Slice into it at any point and you will find a rich vein of material that can suggest new avenues for you to explore in the ancient history and literatures of the world. Sometimes an easy read or a text that hands you all of its answers and does the work for you is not "what the doctor ordered." Hamlet's Mill definitely makes more sense the second and even third time through. That in and of itself makes this book worth your while -- it's a gift that keeps on giving, a book you can keep on reading, even after you reach the end!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 21, 2011
★★★★★ 5
Love learning new things!
Format: Paperback
Love the book but unless you have a foreknowledge of myths from around the world and the experts that have written about them, you will need your phone next to you to look up everything that is being talked about. Like, on every page. Not an easy read.
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Reviewed in the United States on January 14, 2022
★★★★★ 5
Properly intellectual, and both demanding and rewarding as such
Format: Paperback
Anyone who plans to read this book is likely to know its premise already, so, I will not spend time or effort to recap it. All I can say is that the way the book is more eloquent, is altogether smarter, and more beautifully written than I expected. This is a true intellectual treat written with proper intellectual verve. So, no conspiracy theorists, or the simpleton believers in ancient aliens need not apply. If, however, you achieved a proper academic attainment - got your Masters or PhD and enjoy intellectual stimulation, this is a rare gem, to be digested slowly and deliberately, as no similar book is to be encountered any time soon. In other words, just a great book, presenting fascinating thoughts. It does not need anyone’s endorsement, as it is already a well-known entity within its field, yet, here it is – very heartily recommend!
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Reviewed in the United States on June 5, 2017
★★★★★ 5
Get it before it goes back out of print!
Format: Paperback
This book sat on my wish list for years while the price hovered just a bit too high for my liking. My patience has been rewarded with a back in print price that makes getting it a no-brainer. That said, I can't say I believe the main theory of this book, but it is a good start and an enjoyable read regardless. It seems to me that authors feel a need to propound an overarching and impossible-to-prove theory, in order to write some comparative mythology. I was brought to this book a long time ago after reading Charles Hapgood's Map of ancient Sea Kings. Another good author in the same vein is Gavin White, who wrote Babalonian Star Lore and several others.
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Reviewed in the United States on February 16, 2018
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