SanDisk vs Seagate Hard Drives (HDD)

Side-by-side price per gigabyte comparison across 266 products.

As of August 2026, SanDisk averages $0.1274/GB across 4 products while Seagate averages $0.1234/GB across 262 products on BuyPerUnit. Seagate offers 3% better value per gigabyte for hard drives (hdd).

SanDisk

Avg $/GB$0.1274

Best $/GB$0.0586

Price Range$0.0586 – $0.2280

Products4

Cheapest Product

SanDisk Professional 18TB G-DRIVE PROJECT Thunderbolt 3 External Hard Drive

18TB · $1054.99 · newegg

Seagate

Better Value

Avg $/GB$0.1234

Best $/GB$0.0279

Price Range$0.0279 – $3.1289

Products262

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	SanDisk	SanDisk Professional 18TB G-DRIVE PROJECT Thunderbolt 3 External Hard Drive	18TB	$0.0586	$1054.99	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	SanDisk	SanDisk Professional 18TB G-DRIVE PROJECT Thunderbolt 3 External Hard Drive	18TB	$0.0681	$1224.99	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	$0.0301	$481.81	amazon
3	SanDisk	SanDisk G-DRIVE ArmorATD 2 TB Portable Rugged Hard Drive SDPH81G002TGBA	2TB	$0.1075	$214.99	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
4	SanDisk	SanDisk Professional 6TB G-DRIVE PROJECT Thunderbolt 3 External Hard Drive	6TB	$0.1075	$644.99	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
5	SanDisk	SanDisk 1TB G-DRIVE ArmorATD 2.5' External USB 3.2 (Gen 1) Type C 130 MB/s Maximum Read Transfer Rate Portable Hard Drive Space Gray	1TB	$0.1950	$194.99	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, Seagate offers better overall value for hard drives (hdd) at an average of $0.1234/GB compared to SanDisk's $0.1274/GB — that's roughly 3% less per gigabyte.

Seagate's best deal is the Seagate Exos X20z ST20000NM001J 20TB 7.2K RPM SATA 6Gb/s 3.5 (HOST MANAGED SMR) (20TB) at $0.0279/GB, while SanDisk's cheapest option is the SanDisk Professional 18TB G-DRIVE PROJECT Thunderbolt 3 External Hard Drive (18TB) at $0.0586/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 SanDisk or Seagate cheaper per GB for hard drives (hdd)?

As of August 2026, Seagate averages $0.1234/GB compared to SanDisk at $0.1274/GB. Seagate is approximately 3% cheaper per gigabyte on average.

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

BuyPerUnit currently tracks 4 SanDisk products and 262 Seagate products in the hard drives (hdd) category, all ranked by price per gigabyte.

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

The cheapest SanDisk option is the SanDisk Professional 18TB G-DRIVE PROJECT Thunderbolt 3 External Hard Drive at $0.0586/GB ($1054.99 for 18TB).

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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