Compare Hard Drives by Cost Per TB
Stop overpaying for storage. TheDiskGuide tracks hard drive prices daily and calculates the true cost per terabyte — so you can find the best deals on NAS drives, enterprise storage, and high-capacity HDDs from WD, Seagate, and Toshiba.
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Whether you're building a home NAS with Synology or QNAP, setting up a Plex media server, running RAID arrays, or hoarding data on a budget, hard drive prices vary wildly across retailers and capacity points. TheDiskGuide calculates the true cost per terabyte and updates pricing daily from Amazon, so you spend less time shopping and more time building. Find the best drives from WD Red, Seagate IronWolf, Exos, Ultrastar, and Toshiba — whether you need CMR for reliability, refurbished for savings, or enterprise-grade storage for 24/7 operation.
How to Find the Cheapest Hard Drive Per TB
The Cost/TB column is the most important number on this page — it tells you exactly how much you pay per terabyte of storage. Sort by Cost/TB ascending to instantly find the best value drives regardless of brand or capacity. Use the filters to narrow by drive type (CMR vs SMR), form factor, or condition (new, refurbished, renewed) to match your specific use case. Click any retailer badge to go directly to the live Amazon listing with the current price.
Sort by Cost/TB
Click the Cost/TB column header to rank drives by true value, not just sticker price.
Filter by use case
NAS builders should filter to CMR only. RAID arrays need drives rated for 24/7 operation.
Check refurbished
Certified refurbished and renewed drives often cut costs by 40–60% with minimal reliability trade-off.
How We Track Hard Drive Prices
TheDiskGuide pulls live pricing data from Amazon once daily using verified product search queries. Every drive listing is parsed for capacity, recording technology (CMR or SMR), RPM, interface (SATA, SAS, NVMe), and condition. The cost-per-terabyte is calculated automatically and updated every 24 hours so you always see current market prices — not stale data from weeks ago.
We focus exclusively on internal hard drives from major brands — Western Digital, Seagate, Toshiba, and HGST — across all capacity tiers from 4TB to 20TB. Drives are tagged as New, Refurbished, Renewed, or Used so you can make an informed decision based on your budget and reliability requirements. We do not accept payment from manufacturers or retailers to feature or rank specific drives — every result is purely data-driven.
Not Sure Which Drive Is Right for You?
Our guides break down the best drives for specific use cases — from NAS builds and home servers to enterprise RAID arrays. Each guide filters the live database so you only see drives that are actually appropriate for your setup. Not sure about CMR vs SMR? Start with our CMR vs SMR explainer.
Best NAS Hard Drives for Synology, QNAP, TrueNAS
CMR, 24/7-rated drives for Synology and QNAP
Best Hard Drives for Plex Media Servers
High-capacity storage optimized for media servers
Best 16TB Hard Drives – Enterprise Storage
Enterprise-grade helium drives for serious storage
Best Surveillance Hard Drives – DVR & NVR
24/7 recording with WD Purple and SkyHawk
Best Refurbished Hard Drives – Up to 60% Off
Up to 60% cheaper with certified reliability
Best CMR Hard Drives – Safe for RAID & NAS
No SMR — safe for NAS, RAID, and servers
Shop by Brand
Each brand has distinct product lines optimized for different use cases. Our brand guides break down the lineup, compare pricing, and help you pick the right drive.
Frequently Asked Questions
Common questions about hard drive shopping, pricing, and technology.