ADATA vs Seagate Hard Drives (HDD)

Side-by-side price per gigabyte comparison across 271 products.

As of August 2026, ADATA averages $0.0982/GB across 14 products while Seagate averages $0.1221/GB across 257 products on BuyPerUnit. ADATA offers 20% better value per gigabyte for hard drives (hdd).

ADATA

Better Value

Avg $/GB$0.0982

Best $/GB$0.0472

Price Range$0.0472 – $0.1775

Products14

Cheapest Product

5TB AData HD710 Pro USB3.1 2.5-inch Portable Hard Drive (Black)

5TB · $236.07 · newegg

Seagate

Avg $/GB$0.1221

Best $/GB$0.0279

Price Range$0.0279 – $3.1289

Products257

Cheapest Product

Seagate Exos X20z ST20000NM001J 20TB 7.2K RPM SATA 6Gb/s 3.5 (HOST MANAGED SMR)

20TB · $559.00 · newegg

Top Products Compared

Rank	Brand	Product	Capacity	$/GB	Price	Retailer
1	ADATA	5TB AData HD710 Pro USB3.1 2.5-inch Portable Hard Drive (Black)	5TB	$0.0472	$236.07	newegg
1	Seagate	Seagate Exos X20z ST20000NM001J 20TB 7.2K RPM SATA 6Gb/s 3.5 (HOST MANAGED SMR)	20TB	$0.0279	$559.00	newegg
2	ADATA	ADATA HD710 Pro - 2 TB External Hard Drive - Shockproof, Waterproof & Dustproof - Durable Storage - For Gamers, Students & Professionals - Mac, PC & Linux Compatible - Black - AHD710P-2TU31-CBK	2 TB	$0.0625	$124.99	amazon
2	Seagate	Seagate Expansion Desktop 16TB External Hard Drive – USB 3.0, 3.5" HDD for Windows & Mac, Plug-and-Play Backup Storage - STKP16000400	16 TB	$0.0301	$481.81	amazon
3	ADATA	ADATA 2TB HD720 Waterproof / Dustproof / Shockproof External Hard Drive USB 3.0 Model AHD720-2TU3-CBL Blue	2TB	$0.0670	$134.00	newegg
3	Seagate	Seagate BarraCuda ST24000DM001 24TB 7200 RPM SATA 6.0Gb/s 3.5' Hard Drive Bare Drive	24TB	$0.0307	$737.91	newegg
4	ADATA	ADATA 4TB HD710 Pro Portable Hard Drive USB 3.1 Model AHD710P-4TU31-CBK Black	4TB	$0.0681	$272.58	newegg
4	Seagate	Seagate BarraCuda ST24000DM001 24TB 7200 RPM SATA 6.0Gb/s 3.5' Hard Drive Bare Drive	24TB	$0.0313	$749.99	newegg
5	ADATA	ADATA 4TB HD710P Portable Hard Drive USB 3.1 Model AHD710P-4TU31-CBK Black	4TB	$0.0684	$273.41	newegg
5	Seagate	Seagate - Barracuda 8TB Internal Hard Drive for Desktops	8 TB	$0.0325	$259.99	bestbuy

Which Should You Buy?

Based on current pricing data, ADATA offers better overall value for hard drives (hdd) at an average of $0.0982/GB compared to Seagate's $0.1221/GB — that's roughly 20% less per gigabyte.

ADATA's best deal is the 5TB AData HD710 Pro USB3.1 2.5-inch Portable Hard Drive (Black) (5TB) at $0.0472/GB, while Seagate's cheapest option is the Seagate Exos X20z ST20000NM001J 20TB 7.2K RPM SATA 6Gb/s 3.5 (HOST MANAGED SMR) (20TB) at $0.0279/GB.

However, price per GB isn't everything — consider factors like warranty, performance specs, and your specific capacity needs. Check individual product pages for detailed specifications.

Frequently Asked Questions

Is ADATA or Seagate cheaper per GB for hard drives (hdd)?

As of August 2026, ADATA averages $0.0982/GB compared to Seagate at $0.1221/GB. ADATA is approximately 20% cheaper per gigabyte on average.

How many ADATA and Seagate hard drives (hdd) does BuyPerUnit track?

BuyPerUnit currently tracks 14 ADATA products and 257 Seagate products in the hard drives (hdd) category, all ranked by price per gigabyte.

What is the cheapest ADATA hard drives (hdd) per GB?

The cheapest ADATA option is the 5TB AData HD710 Pro USB3.1 2.5-inch Portable Hard Drive (Black) at $0.0472/GB ($236.07 for 5TB).

What is the cheapest Seagate hard drives (hdd) per GB?

The cheapest Seagate option is the Seagate Exos X20z ST20000NM001J 20TB 7.2K RPM SATA 6Gb/s 3.5 (HOST MANAGED SMR) at $0.0279/GB ($559.00 for 20TB).

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