Cheapest 4TB Hard Drives (2026)
Four terabytes is the entry point for serious storage — large enough for a decent media library or full system backup, but still comfortably under $100 new. We track every 4TB HDD listing on Amazon US and UK and rank them by price so you find the cheapest option available right now.
Is 4 TB enough?
4 TB holds around 800 hours of HD video, 1 million photos, or roughly 60 modern games. For a single-drive backup or media storage, it is plenty. For a NAS or growing collection, consider 8 TB for better long-term value per TB.
Quick Verdict
- Who this is for
- Budget storage buyers, first-time NAS builders, backup users, and anyone who needs a simple, affordable drive.
- What usually wins
- The cheapest new 4 TB internal HDD for desktop or NAS use. An external 4 TB portable for plug-and-play backup.
- Prioritise
- Lowest total price. At 4 TB the price-per-TB premium is higher than larger drives — check if an 8 TB drive offers better value per TB for your use case.
Prices updated hourly from Amazon US and UK. All links go directly to the retailer. Details.
Cheapest 4TB Internal HDDs
New 4 TB internal hard drives at the lowest prices. Standard desktop drives with full manufacturer warranty.
Cheapest 4TB External HDDs
Plug-and-play 4 TB external drives. Portable and desktop externals for easy backup without opening your PC.
Cheapest Refurbished 4TB HDDs
Recertified 4 TB drives at bargain prices. Enterprise pulls and refurbished units with seller warranties.
How to Choose
Buying a 4 TB drive is straightforward. Here are the key decisions.
Internal vs external
Internal 3.5" drives are cheaper and fit desktop PCs and NAS enclosures. External drives cost more but require zero setup — just plug in via USB.
4 TB vs 8 TB
Check the price-per-TB of both sizes before buying. Often the 8 TB drive is only 30–50% more expensive but offers twice the space — making it significantly cheaper per TB.
Brand and warranty
Stick with Seagate, WD, or Toshiba for manufacturer warranties (2–5 years). Off-brand drives may be cheaper but lack reliable support.
Use case
For 24/7 NAS use, consider a NAS-rated drive even at 4 TB. For occasional backup or desktop storage, any standard drive is fine.
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