Best way to buy hard drive data storage?

[Mike K]

I purchased this hard drive enclosure:

ORICO 3529RUS3 Tool-free Aluminum 2-Bay 3.5" SATA2.0 USB3.0&eSATA HDD External Docking Station RAID Function 2bay HDD Case

I'm now shopping for (2) WD-Purple, 6TB drives. I see prices that range from $160 to $360 each. The difference seems to be the source and new vs. used. Not having any experience either buying or using such drives I'm struggling to appreciate the huge price difference and associated risks?

 

[zero-degrees]

Lot of times part of the price swing is OEM vacuum pack vs. retail box. $200 is pretty common/average for a 6tb purple retail box drive.

 

[RH-Atl]

$212.98
www.amazon.com/gp/aw/d/B00P0NV43E/ref=mp_s_a_1_7?ie=UTF8&qid=1492568611&sr=8-7&pi=AC_SX236_SY340_FMwebp_QL65&keywords=purple+hard+drive&dpPl=1&dpID=51-Xy6

 

[mando209]

WD - easystore® 8TB External USB 3.0 Hard Drive - Black

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[mando209]

They say that one has wd red drive.good for nvr.wonder if my nvr supports 8tb

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[RH-Atl]

WD Blue HDDs for general purpose storage.
WD Green is basically the as Blue,..
WD Red is a NAS drive. ...
WD Purple is for surveillance. ...
WD Gold, most premium of all.