Best Internal Hard Drives Compared in 2026

Compare these internal hard drives by capacity, 2.5 or 3.5 inch form factor, SAS or SATA interface, listed spindle speed, cache where stated and price before buying. This group spans £22.20 to £401.07, with capacities ranging from 300 GB to 10 TB. Three drives use a SAS interface and two use SATA III, with cache specified on two listings and spindle speeds ranging from 7,200 rpm to 15,000 rpm across the group.

5 selected productsListing snapshot 23 October 2026Selection Editorial

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PC Hardware Compare editorial teamProduct information editor

Winner

HPE M6625 300GB 6G SAS 10K rpm SFF (2.5-inch) Dual Port Hard Drive int

The HPE M6625 at £22.20 is a practical starting point given its low price and dual-port SAS interface, not a declared overall winner.

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Product	Brand	Price	Retailers	Memory capacity	Listed product details
HPE M6625 300GB 6G SAS 10K rpm SFF (2.5-inch) Dual Port Hard Drive int	HP	£22.20	PCHub	300GB	HPE M6625 300GB 6G SAS 10K rpm SFF (2.5-inch) Dual Port Hard Drive internal hard drive 10000 RPM 2.5"
DELL HD 500 S3 7.2 512E 7 AQUACSLIM. C7F2G internal hard drive 500 GB	Dell	£106.87	PCHub	500 GB	DELL HD 500 S3 7.2 512E 7 AQUACSLIM. C7F2G internal hard drive 500 GB 7200 RPM 2.5" Serial ATA III
HPE M6625 300GB 6G SAS 15K rpm SFF (2.5-inch) Dual Port Hard Drive int	HPE	£180.57	PCHub	300GB	HPE M6625 300GB 6G SAS 15K rpm SFF (2.5-inch) Dual Port Hard Drive internal hard drive 15000 RPM 2.5"
Western Digital Ultrastar DC HC310 HUS726T4TAL5204 internal hard drive	Western Digital	£229.09	PCHub	4 TB	Western Digital Ultrastar DC HC310 HUS726T4TAL5204 internal hard drive 4 TB 7200 RPM 256 MB 3.5" SAS
Seagate IronWolf Pro ST10000NT001 internal hard drive 10 TB 7200 RPM 2	Seagate	£401.07	PCHub	10 TB	Seagate IronWolf Pro ST10000NT001 internal hard drive 10 TB 7200 RPM 256 MB 3.5" Serial ATA III

1. HPE M6625 300GB 6G SAS 10K rpm SFF (2.5-inch) Dual Port Hard Drive int

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Price shown £22.20

A 300 GB 2.5 inch SFF drive with dual-port SAS 6G interface and a 10,000 rpm spindle speed.

The HPE M6625 is a 300 GB 2.5 inch SFF drive using a dual-port SAS 6G interface, with a listed spindle speed of 10,000 rpm.

Its capacity is the lowest in this group alongside the other HPE M6625 listing, and cache capacity is not stated for this drive.

Benchmark

Geekbench does not benchmark the primary function of HPE M6625 300GB 6G SAS 10K rpm SFF (2.5-inch) Dual Port Hard Drive int. Its scores measure the processor or graphics device in the test computer, not this product.

Browse Geekbench Community Results

Hard drive throughput and access testing

Compare sequential transfer rate, random access latency and mixed workload performance on the exact drive model.

A comparable third-party result for HPE M6625 300GB 6G SAS 10K rpm SFF (2.5-inch) Dual Port Hard Drive int is not included here. See PassMark disk benchmark method explains the relevant test or benchmark method.

At £22.20 it is the cheapest drive in this group, undercutting the next lowest priced model by £84.67.

Product specifications
Specification	Information
Brand	HP
Price	£22.20
Memory capacity	300GB
Listed product details	HPE M6625 300GB 6G SAS 10K rpm SFF (2.5-inch) Dual Port Hard Drive internal hard drive 10000 RPM 2.5"

Compatible hardware

Check against NAS storage serversMatch drive interface, physical size and supported drive type to the system bay.
Check against Desktop PCsCheck the PC has a compatible bay, connector and storage controller.
Check against PC cases with a suitable drive bayCheck the case has the required 2.5 inch or 3.5 inch bay and connector clearance.

What we like

Lowest price in this group
Dual-port SAS 6G interface stated
Compact 2.5 inch SFF form factor

What we don't like

Lowest capacity in this group at 300 GB
Cache capacity not stated in the listing

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2. DELL HD 500 S3 7.2 512E 7 AQUACSLIM. C7F2G internal hard drive 500 GB

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Price shown £106.87

A 500 GB 2.5 inch drive with a SATA III interface and a 7,200 rpm spindle speed.

The Dell HD 500 S3 is a 500 GB 2.5 inch drive using a SATA III interface, with a listed spindle speed of 7,200 rpm.

Its capacity exceeds both HPE M6625 listings in this group, though cache capacity is not stated for this drive.

Benchmark

Geekbench does not benchmark the primary function of DELL HD 500 S3 7.2 512E 7 AQUACSLIM. C7F2G internal hard drive 500 GB. Its scores measure the processor or graphics device in the test computer, not this product.

Browse Geekbench Community Results

Hard drive throughput and access testing

Compare sequential transfer rate, random access latency and mixed workload performance on the exact drive model.

A comparable third-party result for DELL HD 500 S3 7.2 512E 7 AQUACSLIM. C7F2G internal hard drive 500 GB is not included here. See PassMark disk benchmark method explains the relevant test or benchmark method.

At £106.87 it costs £84.67 more than the lower priced HPE M6625, with SATA III interface and higher capacity among the stated differences.

Product specifications
Specification	Information
Brand	Dell
Price	£106.87
Memory capacity	500 GB
Listed product details	DELL HD 500 S3 7.2 512E 7 AQUACSLIM. C7F2G internal hard drive 500 GB 7200 RPM 2.5" Serial ATA III

Compatible hardware

Check against NAS storage serversMatch drive interface, physical size and supported drive type to the system bay.
Check against Desktop PCsCheck the PC has a compatible bay, connector and storage controller.
Check against PC cases with a suitable drive bayCheck the case has the required 2.5 inch or 3.5 inch bay and connector clearance.

What we like

Lowest priced SATA interface drive in this group
Higher capacity than both HPE M6625 listings
Compact 2.5 inch form factor

What we don't like

Cache capacity not stated in the listing
Lower spindle speed than the 15,000 rpm HPE M6625

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3. HPE M6625 300GB 6G SAS 15K rpm SFF (2.5-inch) Dual Port Hard Drive int

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Price shown £180.57

A 300 GB 2.5 inch SFF drive with dual-port SAS 6G interface and a 15,000 rpm spindle speed.

The HPE M6625 is a 300 GB 2.5 inch SFF drive using a dual-port SAS 6G interface, with a listed spindle speed of 15,000 rpm.

This spindle speed is the highest stated in this group, though its capacity matches the lower priced HPE M6625 listing and cache capacity is not stated.

Benchmark

Geekbench does not benchmark the primary function of HPE M6625 300GB 6G SAS 15K rpm SFF (2.5-inch) Dual Port Hard Drive int. Its scores measure the processor or graphics device in the test computer, not this product.

Browse Geekbench Community Results

Hard drive throughput and access testing

Compare sequential transfer rate, random access latency and mixed workload performance on the exact drive model.

A comparable third-party result for HPE M6625 300GB 6G SAS 15K rpm SFF (2.5-inch) Dual Port Hard Drive int is not included here. See PassMark disk benchmark method explains the relevant test or benchmark method.

At £180.57 it costs £73.70 more than the Dell, with a higher listed spindle speed among the stated differences despite matching capacity with the lower priced HPE M6625.

Product specifications
Specification	Information
Brand	HPE
Price	£180.57
Memory capacity	300GB
Listed product details	HPE M6625 300GB 6G SAS 15K rpm SFF (2.5-inch) Dual Port Hard Drive internal hard drive 15000 RPM 2.5"

Compatible hardware

Check against NAS storage serversMatch drive interface, physical size and supported drive type to the system bay.
Check against Desktop PCsCheck the PC has a compatible bay, connector and storage controller.
Check against PC cases with a suitable drive bayCheck the case has the required 2.5 inch or 3.5 inch bay and connector clearance.

What we like

Highest spindle speed in this group at 15,000 rpm
Dual-port SAS 6G interface stated
Compact 2.5 inch SFF form factor

What we don't like

Same 300 GB capacity as the lower priced HPE M6625 despite the higher price
Cache capacity not stated in the listing

Check price at PCHub

4. Western Digital Ultrastar DC HC310 HUS726T4TAL5204 internal hard drive

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Price shown £229.09

A 4 TB 3.5 inch drive with a SAS interface, 7,200 rpm spindle speed and 256 MB cache.

The Western Digital Ultrastar DC HC310 is a 4 TB 3.5 inch drive using a SAS interface, with a listed spindle speed of 7,200 rpm and 256 MB cache.

Its 3.5 inch form factor and 4 TB capacity are both larger than any of the three SAS or SATA drives above in this group.

Benchmark

Geekbench does not benchmark the primary function of Western Digital Ultrastar DC HC310 HUS726T4TAL5204 internal hard drive. Its scores measure the processor or graphics device in the test computer, not this product.

Browse Geekbench Community Results

Hard drive throughput and access testing

Compare sequential transfer rate, random access latency and mixed workload performance on the exact drive model.

A comparable third-party result for Western Digital Ultrastar DC HC310 HUS726T4TAL5204 internal hard drive is not included here. See PassMark disk benchmark method explains the relevant test or benchmark method.

At £229.09 it costs £48.52 more than the 15,000 rpm HPE M6625, with substantially higher capacity and confirmed cache among the stated differences.

Product specifications
Specification	Information
Brand	Western Digital
Price	£229.09
Memory capacity	4 TB
Listed product details	Western Digital Ultrastar DC HC310 HUS726T4TAL5204 internal hard drive 4 TB 7200 RPM 256 MB 3.5" SAS

Compatible hardware

Check against NAS storage serversMatch drive interface, physical size and supported drive type to the system bay.
Check against Desktop PCsCheck the PC has a compatible bay, connector and storage controller.
Check against PC cases with a suitable drive bayCheck the case has the required 2.5 inch or 3.5 inch bay and connector clearance.

What we like

256 MB cache confirmed
Highest capacity among SAS drives in this group at 4 TB
Larger 3.5 inch form factor

What we don't like

Lower spindle speed than the 15,000 rpm HPE M6625
Higher price than the three lower capacity drives in this group

Check price at PCHub

5. Seagate IronWolf Pro ST10000NT001 internal hard drive 10 TB 7200 RPM 2

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Price shown £401.07

A 10 TB 3.5 inch drive with a SATA III interface, 7,200 rpm spindle speed, 256 MB cache and stated multi-bay use.

The Seagate IronWolf Pro ST10000NT001 is a 10 TB 3.5 inch drive using a SATA III interface, with a listed spindle speed of 7,200 rpm and 256 MB cache.

Its capacity is the highest in this group, and multi-bay use is stated in its listing, a feature not mentioned for the other four drives here.

Benchmark

Geekbench does not benchmark the primary function of Seagate IronWolf Pro ST10000NT001 internal hard drive 10 TB 7200 RPM 2. Its scores measure the processor or graphics device in the test computer, not this product.

Browse Geekbench Community Results

Hard drive throughput and access testing

Compare sequential transfer rate, random access latency and mixed workload performance on the exact drive model.

A comparable third-party result for Seagate IronWolf Pro ST10000NT001 internal hard drive 10 TB 7200 RPM 2 is not included here. See PassMark disk benchmark method explains the relevant test or benchmark method.

At £401.07 it is the most expensive drive in this group, priced £171.98 above the Western Digital while offering more than double the capacity.

Product specifications
Specification	Information
Brand	Seagate
Price	£401.07
Memory capacity	10 TB
Listed product details	Seagate IronWolf Pro ST10000NT001 internal hard drive 10 TB 7200 RPM 256 MB 3.5" Serial ATA III

Compatible hardware

Check against NAS storage serversMatch drive interface, physical size and supported drive type to the system bay.
Check against Desktop PCsCheck the PC has a compatible bay, connector and storage controller.
Check against PC cases with a suitable drive bayCheck the case has the required 2.5 inch or 3.5 inch bay and connector clearance.

What we like

Highest capacity in this group at 10 TB
256 MB cache confirmed
Stated multi-bay use

What we don't like

Highest price in this group
Same 7,200 rpm spindle speed as the Dell and Western Digital despite the higher price

Check price at PCHub

Prices shown reflect the available listing details and can change. Check stock, delivery, compatibility and full product specifications with PCHub before ordering.