ADATA vs Seagate Hard Drives (HDD)

Side-by-side price per gigabyte comparison across 284 products.

As of September 2026, ADATA averages $0.0995/GB across 12 products while Seagate averages $0.1125/GB across 272 products on BuyPerUnit. ADATA offers 12% better value per gigabyte for hard drives (hdd).

ADATA

Better Value

Avg $/GB$0.0995

Best $/GB$0.0575

Price Range$0.0575 – $0.1630

Products12

Cheapest Product

ADATA 2TB HD710 Pro Portable Hard Drive USB 3.1 Model AHD710P-2TU31-CBK Black

2TB · $115.00 · newegg

Seagate

Avg $/GB$0.1125

Best $/GB$0.0300

Price Range$0.0300 – $3.1980

Products272

Cheapest Product

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

20TB · $599.00 · newegg

Top Products Compared

Rank	Brand	Product	Capacity	$/GB	Price	Retailer
1	ADATA	ADATA 2TB HD710 Pro Portable Hard Drive USB 3.1 Model AHD710P-2TU31-CBK Black	2TB	$0.0575	$115.00	newegg
1	Seagate	Seagate Exos X20z ST20000NM001J 20TB 7.2K RPM SATA 6Gb/s 3.5 (HOST MANAGED SMR)	20TB	$0.0300	$599.00	newegg
2	ADATA	ADATA HD710 Pro, External Hard Drive, Blue, 2TB	2 TB	$0.0640	$128.00	amazon
2	Seagate	Seagate - Barracuda 8TB Internal Hard Drive for Desktops	8 TB	$0.0312	$249.99	bestbuy
3	ADATA	ADATA 2TB HV320 Portable Hard Drive USB 3.2 Gen1 Model AHV320-2TU31-CBK Black	2TB	$0.0684	$136.90	newegg
3	Seagate	Seagate BarraCuda NE-ST8000DM004 8TB 5400 RPM 256MB Cache SATA 6.0Gb/s 3.5' Internal Hard Drive Bare Drive	8TB	$0.0312	$249.99	newegg
4	ADATA	ADATA 4TB HD710P Portable Hard Drive USB 3.1 Model AHD710P-4TU31-CBK Black	4TB	$0.0695	$277.96	newegg
4	Seagate	Seagate BarraCuda 8 TB Internal Hard Drive HDD – 3.5 Inch SATA 6 Gb/s, 5,400 RPM, 256 MB Cache for Computer Desktop PC (ST8000DMZ04/004)	8 TB	$0.0312	$249.99	amazon
5	ADATA	ADATA 4TB HD710P Portable Hard Drive USB 3.1 Model AHD710P-4TU31-CBK Black	4TB	$0.0695	$278.03	newegg
5	Seagate	Seagate BarraCuda Internal Hard Drive 8TB SATA 6Gb/s 256MB Cache 3.5-Inch (ST8000DM004),Mechanical Hard Disk	8 TB	$0.0312	$249.99	amazon

Which Should You Buy?

Based on current pricing data, ADATA offers better overall value for hard drives (hdd) at an average of $0.0995/GB compared to Seagate's $0.1125/GB — that's roughly 12% less per gigabyte.

ADATA's best deal is the ADATA 2TB HD710 Pro Portable Hard Drive USB 3.1 Model AHD710P-2TU31-CBK Black (2TB) at $0.0575/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 $0.0300/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 September 2026, ADATA averages $0.0995/GB compared to Seagate at $0.1125/GB. ADATA is approximately 12% cheaper per gigabyte on average.

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

BuyPerUnit currently tracks 12 ADATA products and 272 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 ADATA 2TB HD710 Pro Portable Hard Drive USB 3.1 Model AHD710P-2TU31-CBK Black at $0.0575/GB ($115.00 for 2TB).

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 $0.0300/GB ($599.00 for 20TB).

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