Seagate vs Silicon Power Hard Drives (HDD)

Side-by-side price per gigabyte comparison across 276 products.

As of July 2026, Seagate averages $0.1449/GB across 268 products while Silicon Power averages $0.0979/GB across 8 products on BuyPerUnit. Silicon Power offers 32% better value per gigabyte for hard drives (hdd).

Seagate

Avg $/GB$0.1449

Best $/GB$0.0279

Price Range$0.0279 – $3.1289

Products268

Cheapest Product

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

20TB · $559.00 · newegg

Silicon Power

Better Value

Avg $/GB$0.0979

Best $/GB$0.0582

Price Range$0.0582 – $0.1760

Products8

Cheapest Product

4TB Silicon Power Armor A60 Shockproof Portable Hard Drive - USB3.2 - All-Black Edition

4TB · $232.99 · newegg

Top Products Compared

Rank	Brand	Product	Capacity	$/GB	Price	Retailer
1	Seagate	Seagate Exos X20z ST20000NM001J 20TB 7.2K RPM SATA 6Gb/s 3.5 (HOST MANAGED SMR)	20TB	$0.0279	$559.00	newegg
1	Silicon Power	4TB Silicon Power Armor A60 Shockproof Portable Hard Drive - USB3.2 - All-Black Edition	4TB	$0.0582	$232.99	newegg
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	$0.0303	$485.09	amazon
2	Silicon Power	5TB Silicon Power Armor A60 Shockproof Portable Hard Drive - USB3.0 - Black/Green Edition	5TB	$0.0600	$299.99	newegg
3	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	$0.0311	$248.55	amazon
3	Silicon Power	Silicon Power 4TB Armor A60 IPX4 Water-resistant and Shockproof Portable Hard Drive USB 3.1 Gen1 Model SP040TBPHDA60S3K Black	4TB	$0.0822	$328.99	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
4	Silicon Power	Silicon Power 2TB Armor A60 Shockproof and Water-Resistant Portable Hard Drive USB 3.0 Model SP020TBPHDA60S3K Black	2TB	$0.0865	$172.99	newegg
5	Seagate	Seagate Exos X16 14TB 3.5' SATA 7200rpm Internal Hard Disk Drive ST14000NM001G20	14TB	$0.0329	$460.32	newegg
5	Silicon Power	2TB Silicon Power Armor A60 Shockproof Portable Hard Drive - USB3.2 - All-Black Edition	2TB	$0.0865	$172.99	newegg

Which Should You Buy?

Based on current pricing data, Silicon Power offers better overall value for hard drives (hdd) at an average of $0.0979/GB compared to Seagate's $0.1449/GB — that's roughly 32% less per gigabyte.

Silicon Power's best deal is the 4TB Silicon Power Armor A60 Shockproof Portable Hard Drive - USB3.2 - All-Black Edition (4TB) at $0.0582/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 Seagate or Silicon Power cheaper per GB for hard drives (hdd)?

As of July 2026, Silicon Power averages $0.0979/GB compared to Seagate at $0.1449/GB. Silicon Power is approximately 32% cheaper per gigabyte on average.

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

BuyPerUnit currently tracks 268 Seagate products and 8 Silicon Power products in the hard drives (hdd) category, all ranked by price per gigabyte.

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).

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

The cheapest Silicon Power option is the 4TB Silicon Power Armor A60 Shockproof Portable Hard Drive - USB3.2 - All-Black Edition at $0.0582/GB ($232.99 for 4TB).

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