About the data

This is an aggregator, not a reference work. It exists to help you narrow a search before you go and read the listings themselves.

Where the prices come from

Two sellers: eBay and ServerPartDeals. Every offer links out to the seller, nothing is sold here, and the price you see is the seller's own. Outbound offer links are affiliate links, which is how the site pays for itself; it does not change what is shown or how it is ranked.

How fresh they are

Both sellers are swept every four hours and the pages are rebuilt from that sweep. Each page carrying offers says when they were last confirmed. Anything older than six hours is not displayed at all.

Why there are no averages

No average price, no price history chart, no "prices down 12% this month". eBay's API licence forbids publishing figures derived from their listing data, so the site publishes none — not a softened version. What you get is the price of each individual offer, and a per-offer figure such as dollars per terabyte calculated from that one offer alone.

Why the same product is listed twice

Because it is two things you can buy. The same drive from two sellers has two prices, two warranties and two returns policies, so the offers are never merged into one. Deciding between them is the point.

Why a dollars-per-terabyte figure is sometimes missing

Because it would be wrong. A drive sold for parts is not sold with its capacity, and a listing whose shipping cost is not stated has no landed price to divide. Those are shown as a dash rather than as a number that looks calculated.

How complete the specifications are

Unevenly, and this is the honest answer. Every drive states its capacity; most state their interface and form factor. Fewer state cache, sector format or whether they are CMR or SMR — a fact worth knowing, which is why there is a guide about it. A product page states what the catalog holds for that product and does not pad it out with guesses. Where a manufacturer's manual has been recorded, it is linked so you can check for yourself.

Specifications come from seller data and from manufacturer documentation, and neither is right every time. The listings are the authority on what you are actually buying; read them before you spend anything.