Hard Drives (HDD)

Ranked by price per gigabyte

Updated twice daily · No paid placements

As of October 29, 2026, 18:27 UTC, the cheapest hard drives (hdd) on BuyPerUnit costs $0.0250/GB — a Seagate Expansion Desktop 16TB External Hard Drive HDD - USB 3.0 - STKP16000400 available at Newegg for $399.99. BuyPerUnit tracks 1092 hard drives (hdd) products across Amazon, Best Buy, and Newegg, updated twice daily. The median price is $0.0666/GB. Methodology: price ÷ capacity.

Most tracked Hard Drives (HDD)

Products with the longest price history on BuyPerUnit

Buy Cheap Hard Drives: Find the Best HDD Deals in 2026

Looking to buy cheap hard drives? You're in the right place. BuyPerUnit compares 1092+ HDDs ranked by price per gigabyte — a capacity-cost comparison to use alongside compatibility, performance and warranty.

Right now, the cheapest HDD storage starts at just $0.025/GB, while the average on this page is $0.000/GB. Whether you need bulk storage for backups, a NAS, or a media server, we help you find the best deal. For faster storage, compare SSDs here.

HDD Buying Guide: Get the Best Value

1. Compare Price Per GB

A $150 4TB drive ($0.037/GB) beats a $70 1TB drive ($0.07/GB) in value. Always divide price by capacity to find the real cost — that's what we do for every listing.

2. Bigger = Cheaper Per GB

Storage follows economies of scale. 4TB+ drives almost always have the lowest price per gigabyte. Buy more capacity upfront to save long-term.

3. Match RPM to Your Use Case

7200 RPM drives are faster and better for desktop use or active NAS workloads. 5400 RPM drives run cooler and quieter — ideal for bulk archival or always-on backup drives where speed is less critical.

4. Watch for Sales

Hard drive prices fluctuate. We update prices daily so you can catch the best deals. Bookmark this page and check back regularly.

3.5" Desktop vs 2.5" Laptop HDD: Which Should You Buy?

Type	Typical $/GB	Max Capacity	Best For
3.5" Desktop HDD	$0.015–0.025	20TB+	Desktop PC, NAS, media server
2.5" Laptop HDD	$0.025–0.045	5TB	Laptop upgrade, portable use
External HDD	$0.020–0.040	20TB+	Backup, portable storage, archiving

Frequently Asked Questions About Buying Hard Drives

What is the cheapest hard drive per GB right now?

The cheapest HDD storage per gigabyte is currently $0.0250/GB. Large capacity 3.5" desktop drives (6TB+) from Seagate or WD consistently offer the lowest price per gigabyte in the HDD category.

Is it better to buy one large hard drive or multiple smaller ones?

One large drive is almost always cheaper per GB. However, multiple drives provide redundancy — if one fails, you don't lose everything. For important data, consider buying two drives and keeping backups on both.

Should I buy 5400 RPM or 7200 RPM?

For desktop use or a NAS with active read/write workloads, 7200 RPM is noticeably faster and worth the small premium. For cold storage, archival backups, or always-on low-activity drives, 5400 RPM runs cooler, quieter, and uses less power.

When is the best time to buy cheap hard drives?

Black Friday, Cyber Monday, and Amazon Prime Day typically have the best deals. However, prices fluctuate year-round. We update our rankings daily so you can always find the current best value.

What brands make the most reliable hard drives?

Seagate, Western Digital (WD), and Toshiba are the three major HDD manufacturers. All produce reliable drives at different price points. Seagate Barracuda and WD Blue are popular desktop choices; WD Red and Seagate IronWolf are designed for NAS use.

How We Find the Cheapest Hard Drives

BuyPerUnit calculates the price per gigabyte for every hard drive by dividing the current price by the storage capacity. This gives you the true cost of storage, making it easy to compare drives of different sizes.

Products are ranked from best value (lowest $/GB) to worst. We update prices regularly from Amazon, Best Buy, and Newegg to ensure you always see current deals. Click any product to view the latest price and purchase directly.

BuyPerUnit is an affiliate site. We earn a commission when you purchase through our links at no extra cost to you.

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