Seagate vs Western Digital Hard Drives (HDD)

Side-by-side price per gigabyte comparison across 540 products.

As of August 2026, Seagate averages $0.1221/GB across 257 products while Western Digital averages $0.0773/GB across 283 products on BuyPerUnit. Western Digital offers 37% better value per gigabyte for hard drives (hdd).

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

Western Digital

Better Value

Avg $/GB$0.0773

Best $/GB$0.0265

Price Range$0.0265 – $1.5000

Products283

Cheapest Product

WD2003FYYS-18W0B0 - DELL WD2003FYYS-18W0B0 DELL 2TB 7.2K 3G LFF SATA HARD DRIVE

2TB · $52.95 · 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	Western Digital	WD2003FYYS-18W0B0 - DELL WD2003FYYS-18W0B0 DELL 2TB 7.2K 3G LFF SATA HARD DRIVE	2TB	$0.0265	$52.95	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	$0.0301	$481.81	amazon
2	Western Digital	WD Elements 18TB USB 3.0 Desktop External Hard Drive NE-WDBWLG0180HBK-NESN Black	18TB	$0.0342	$614.99	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
3	Western Digital	WD 14TB My Book Desktop External Hard Drive, USB 3.0, External HDD with Password Protection and Backup Software - WDBBGB0140HBK-NESN	14 TB	$0.0342	$478.55	amazon
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	Western Digital	WD Ultrastar DC HC550 18TB Hard Drive 3.5' Internal 512MB SATA 7200 RPM 512E SE NP3 DC HC550 0F38459 (WUH721818ALE6L4)	18TB	$0.0342	$615.95	newegg
5	Seagate	Seagate - Barracuda 8TB Internal Hard Drive for Desktops	8 TB	$0.0325	$259.99	bestbuy
5	Western Digital	WD 20TB Elements Desktop External Hard Drive, USB 3.0 drive for plug-and-play storage - WDBWLG0200HBK-NESN	20 TB	$0.0350	$700.35	amazon

Which Should You Buy?

Based on current pricing data, Western Digital offers better overall value for hard drives (hdd) at an average of $0.0773/GB compared to Seagate's $0.1221/GB — that's roughly 37% less per gigabyte.

Western Digital's best deal is the WD2003FYYS-18W0B0 - DELL WD2003FYYS-18W0B0 DELL 2TB 7.2K 3G LFF SATA HARD DRIVE (2TB) at $0.0265/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 Western Digital cheaper per GB for hard drives (hdd)?

As of August 2026, Western Digital averages $0.0773/GB compared to Seagate at $0.1221/GB. Western Digital is approximately 37% cheaper per gigabyte on average.

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

BuyPerUnit currently tracks 257 Seagate products and 283 Western Digital 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 Western Digital hard drives (hdd) per GB?

The cheapest Western Digital option is the WD2003FYYS-18W0B0 - DELL WD2003FYYS-18W0B0 DELL 2TB 7.2K 3G LFF SATA HARD DRIVE at $0.0265/GB ($52.95 for 2TB).

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