Frequently asked questions

Quick answers to the questions we're asked most about buying storage and using disks.co.uk.

How does disks.co.uk rank hard drives?

We rank every drive by its real cost per terabyte (£/TB): the current Amazon.co.uk price divided by the drive's capacity in terabytes. This shows true value rather than just the headline price, so the best-value drives sit at the top.

How often are prices updated?

Prices and price history are refreshed automatically several times a day using Keepa data. Each listing shows when it was last updated, and the price you pay is always the live price on Amazon.co.uk at checkout.

Is price per terabyte really the best way to compare drives?

It's the fairest way to compare value, but not the only factor. An SSD and an HDD at the same £/TB are not equivalent in speed, and NAS or enterprise drives cost more per terabyte because they're built for sustained use. Use £/TB to shortlist, then check speed, warranty and condition.

What's the difference between SSD, NVMe and HDD?

HDDs are mechanical and cheapest per terabyte; SSDs have no moving parts and are far faster; NVMe SSDs are the fastest of all. See our SSD vs HDD and NVMe vs SATA guides for the full picture.

Are the Amazon prices on this site accurate?

We work hard to keep them accurate via Keepa and refresh them several times daily, but prices change constantly. Always confirm the current price on Amazon.co.uk before buying — that is the price that applies.

Do you make money from the links?

Yes. As an Amazon Associate we earn from qualifying purchases made through our links, at no extra cost to you. This never affects our rankings, which are based purely on £/TB and price history. See our affiliate disclosure for details.

Where do the star ratings come from?

The star ratings on product pages are the real Amazon customer ratings and review counts, sourced via Keepa. Drives with no reviews simply show no rating.

Which drive should I buy for backups or a NAS?

For bulk storage and backups, a large 3.5" hard drive usually gives the best £/TB. For an always-on NAS, choose NAS-rated drives and avoid SMR models for RAID — see our NAS and SMR vs CMR guides.