Question 1

What is the RPM platter spin speed?5400?7200?Thanks for any input.

Accepted Answer

Clearly its 5400 RPM. The 7200 RPM drives run too hot and would not be a good choice for this application.

Question 2

why does it say it has no space?

Accepted Answer

Your computer has to be set to recognize it as a drive.  Until this is done, it is not usable and thus will show “no space:”. The method to do this varies slightly from OS to OS, so I suggest looking up “how to add a hard drive” for your specific OS.

Question 3

I want to replace the hard drive on my Lorex security system, do I need to format this drive after purchasing it?

Accepted Answer

Yes you will but I advise getting another brand. My 2 TB went bad in just a few weeks and was not covered under warranty due to the 30 limit I believe.

Question 4

Does the 8 tb model have a 128mb cache or 256mb cache? i found the product on another website, and there's is 256mb.

Accepted Answer

Western Digital sells 128MB cache and 256mb cache versions of the 8TB purple drive: https://www.wd.com/products/internal-storage/wd-purple-surveillance-hard-drive.html#WD80PURZ.  Saving even several streams of high definition digital CCTV video is very low-demand from a performance perspective.  It doesn't matter which version you use.

Personally, though, I wouldn't buy another purple drive.  I bought 8 of them and not a single one lasted through the warranty period.  These drives are designed for 180TB total writing per year, or about 500GB per day, easily enough to handle an average of 10 cameras recording 3mp 24/7 but mine all failed with no more than 2 cameras storing to any single drive.  Luckily, I didn't lose any critical video (had no break-ins or burglaries)  between failure and replacement of these purple drives but I need better reliability than these gave me.  I will have to give WD credit for replacing all of the drives that I got sent to them on time.  A couple failed in a remote location a couple months before warranty ended and I couldn't get to them on time to send in so those two are on me.

I've switched to all enterprise grade drives that are designed for 550 TB per year hoping to get more reliability.  Search for this ASIN on Amazon for the suitable WD drive: B074WH5NPT

ASIN	B00IMPO5OW
Best Sellers Rank	47,779 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 150 in Internal Hard Drives
Brand Name	Western Digital
Cache Memory Installed Size	64
Color	Purple
Compatible Devices	[Monitoring Systems]
Customer Reviews	4.3 4.3 out of 5 stars (2,267)
Data Transfer Rate	750 Gigabits Per Second
Digital Storage Capacity	4 TB
Enclosure Material	high-quality plastics and metals
Form Factor	3.5-inch
Global Trade Identification Number	00718037823317, 04016138885248, 05054230729472
Hard Disk Description	Mechanical Hard Disk
Hard Disk Form Factor	3.5 Inches
Hard Disk Interface	Serial ATA-600
Hard Disk Rotational Speed	5400 RPM
Hard-Drive Size	4 TB
Hardware Connectivity	SATA 6.0 Gb/s
Installation Type	Internal Hard Drive
Item Dimensions L x W x Thickness	22.6L x 15.7W x 7.6Th centimetres
Item Part Number	WD40PURX
Item Weight	730 g
Manufacturer	Western Digital
Manufacturer Part Number	WD40PURX
Media Speed	5,7 GB/s
Model Name	PUR
Model Number	WD40PURZ
Network Connectivity Technology	SATA
Number of Items	1
Product Features	IntelliPower^Operating temperature range:0 - 65 °C
Product Warranty	3 years
Read Speed	6000 Megabytes Per Second
Specific Uses For Product	General Computer Storage
UPC	898029660981 809392594926 013862100856 613652433722 027043689924 718037823317
Unit Count	1.00 count

WD 4 TB Surveillance Hard Drive - Purple

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