I need a big hard drive for storing alot of media files, there will be no operating system or programs installed on the drive, just media files, would this drive be a good choice for this?

No, this would not be a good choice. WD Purple drives are tailored for heavy write use, such as found with recording security camera footage. Not so good for read/write use such as media file access. WD Blue (general purpose) or red (NAS/storage) would likely be better options.

Does this come with the power cable? Or maybe I need to look on the Lorex site...I'm adding this as a second drive in a Lorex box...the Lorex box has the second SATA cable, a second spot to plug the power cable, but no power cable.

Drive only, no cables (neither power nor SATA).

I have to buy up to a 6 or 8TB HDD to gain 125 and 256MB's of Cache?

We buy these alot. We are a major Security company that installs these in businesses, schools, banks. :)

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WD Purple WD81PURZ 8TB 5400 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive

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Supports for more than 8 bays.
Supports up to 180TB/year workload rate.
Engineered specifically for surveillance security systems.
Tuned for write-intensive, low bit-rate, high stream-count applications typical to most surveillance applications.
Prioritized write-operations for maximized surveillance performance.
TLER & ATA streaming support.
Tarnish-resistant components.
3-year limited warranty.

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3.58 WD Purple (WD81PURZ) SATA 256 Cache Buffer

Model
Brand	WD
Series	Purple
Model	WD81PURZ

Performance
Interface	SATA 6.0Gb/s
Capacity	8TB
RPM	5400 RPM
Cache	256MB

Features
Features	Western Digital's exclusive AllFrame technology All WD Purple drives are equipped with AllFrame technology, which improves ATA streaming to help reduce frame loss, improve overall video playback, and increase the number of hard drive bays supported within a NVR. Help make your surveillance solution future-ready knowing that WD Purple drives are ready for ultra high definition cameras. WD Purple capacities up to 8TB feature AllFrame 4K technology enabling high quality recording for up to 64 cameras. WD Purple 10TB and 12TB capacities feature AllFrame AI technology that enables not only recording up to 64 cameras, but also an additional 32 streams for Deep Learning analytics within the system. Enhanced workload ratings WD Purple drives with AllFrame 4K technology feature a workload rating of up to 180TB/year - up to three times that of desktop drives - to handle the unique demands of modern video surveillance DVR and NVR systems. WD Purple 10TB and 12TB drives with AllFrame AI feature a workload rating up to 360TB/year to support the Deep Learning analytics that are features in AI capable NVRs. Expand your view to 64 Each WD Purple drive is optimized to support up to 64 cameras. Designed for today's and tomorrow's surveillance solutions With an MTBF of up to 1.5 million hours, WD Purple drives are engineered for mainstream surveillance DVRs and NVRs that operate 24/7. With support for more than eight bays and tarnish resistant components, WD Purple drives deliver reliable operation in large scale surveillance systems in harsh environments. Field-proven high capacity Now on its 4th generation and with more than 27 million drives shipped, field-proven HelioSeal technology delivers trusted high-capacity WD Purple storage (8TB, 10TB, and 12TB) for the massive storage needs of 4K surveillance video.
Usage	For Video Surveillance

Dimensions
Form Factor	3.5"
Height (maximum)	26.10mm
Width (maximum)	101.60mm
Length (maximum)	147.00mm

Additional Information
First Listed on Newegg	April 01, 2019

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Limited Warranty period (parts): 3 years
Limited Warranty period (labor): 3 years
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Return Policies

Return for refund within: 30 days

Return for replacement within: 30 days

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Manufacturer Contact Info

Manufacturer Product Page
Manufacturer Website
Support Phone: 1-800-275-4932
Support Website
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WD Purple WD81PURZ 8TB 5400 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive

Learn more about the Western Digital WD81PURZ

Customer Reviews of the Western Digital WD81PURZ

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: N82E16822234347

WD Purple WD81PURZ 8TB 5400 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive

Learn more about the Western Digital WD81PURZ

Customer Reviews of the Western Digital WD81PURZ

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info