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ADATA SU630 480GB vs BUFFALO External SSD 500GB

Comparison

ADATA SU630 480GB vs BUFFALO External SSD 500GB

The ADATA Ultimate SU630 480GB is an internal SATA SSD aimed at upgrading a PC or notebook from a hard drive, while the BUFFALO External SSD 500GB is a portable USB storage option for computers and listed consoles. ADATA is the stronger choice for a compatible internal upgrade and higher stated transfer speeds; BUFFALO is more suitable for portable, cross-device storage.

Expert tested Data driven Unbiased reviews Updated 2 August 2026
ADATA Ultimate SU630 480GB Solid State Drive

#1 Overall Winner

ADATA Ultimate SU630 480GB Solid State Drive

83/100
  • Up to 520MB/s read and 450MB/s write speeds are specified.
View review
BUFFALO External SSD 500GB

Contender

BUFFALO External SSD 500GB

74/100
  • External USB 3.2 storage with both USB-A and USB-C connectivity support.
View review

Quick verdict

Choose the ADATA SU630 if you want to replace a compatible 2.5-inch SATA HDD and prioritize higher stated speeds, migration tools, and overall value. Choose the BUFFALO External SSD if you need a pocketable drive for USB-connected PCs, Macs, or listed console storage and value USB-A/USB-C flexibility.

Overall winner

Depends on your needs

At-a-glance comparison

Feature ADATA Ultimate SU630 480GB Solid State Drive BUFFALO External SSD 500GB Winner
Drive type Internal 2.5-inch SATA SSD External USB SSD Depends
Capacity 480GB 500GB BUFFALO External SSD 500GB
Specified read speed Up to 520MB/s Up to 340MB/s ADATA Ultimate SU630 480GB Solid State Drive
Specified write speed Up to 450MB/s Up to 320MB/s ADATA Ultimate SU630 480GB Solid State Drive
Connectivity SATA 6.0Gb/s USB 3.2, USB-A and USB-C BUFFALO External SSD 500GB
Compatibility PC/notebook PC, Mac, PS4 and PS5 listed BUFFALO External SSD 500GB
Setup Internal installation; migration utility included External connection; PS5 setup may need formatting steps ADATA Ultimate SU630 480GB Solid State Drive
Portability 47g internal component Compact external drive BUFFALO External SSD 500GB
Data tools SSD Toolbox and migration utility Formatting tool referenced in review ADATA Ultimate SU630 480GB Solid State Drive
Durability feedback No mechanical parts; long-term uncertainty noted Shock-resistant claim; mixed shell feedback Depends
Warranty information Two-year EU spare-part availability listed Three years registered, two years unregistered BUFFALO External SSD 500GB
Overall comparison score Higher overall score Lower overall score ADATA Ultimate SU630 480GB Solid State Drive

Detailed comparison

Performance

The ADATA has the stronger specified storage performance, with up to 520MB/s reads and 450MB/s writes compared with BUFFALO’s 340MB/s reads and 320MB/s writes. Its performance score is also higher, and user reviews commonly report much faster booting after replacing an HDD. BUFFALO remains faster than an HDD by design and receives positive speed feedback, but it is the lower-speed option on the supplied specifications.

Speed

ADATA is ahead for speed based on both the provided scores and specified throughput. Its up-to-520MB/s read and 450MB/s write ratings exceed BUFFALO’s stated 340MB/s read and 320MB/s write ratings. The difference favors ADATA for boot drives and internal file transfers, provided the computer supports a 2.5-inch SATA installation.

Reliability

ADATA has a slightly stronger supplied reliability score and many positive reports of continued operation, although one review describes failure after several years. BUFFALO receives positive reliability comments too, but the supplied feedback includes reports of data corruption, severe slowdowns, and support dissatisfaction. These are individual reports rather than universal outcomes, but they make regular backups especially important for either drive.

ADATA Ultimate SU630 480GB Solid State Drive

Pros

  • Up to 520MB/s read and 450MB/s write speeds are specified.
  • Designed as a straightforward 2.5-inch SATA upgrade from a mechanical hard drive.
  • Dynamic SLC caching and LDPC ECC are provided for performance and data integrity.
  • SSD Toolbox and migration utility support drive monitoring and migration.
  • Customer feedback frequently reports faster booting and easy HDD replacement.
  • Higher overall, performance, speed, value, setup, and customer-satisfaction scores in this comparison.

Cons

  • It is an internal SATA drive, so it requires installation inside a compatible PC or notebook.
  • 480GB offers slightly less stated capacity than the BUFFALO drive.
  • QLC NAND is positioned as a value-focused storage solution.
  • Long-term durability and reliability are less certain in the provided feedback, including one report of failure after several years.
  • Its SATA connection is less convenient than plug-in USB storage for moving files between devices.
ADATA Ultimate SU630 480GB Solid State Drive

BUFFALO External SSD 500GB

Pros

  • External USB 3.2 storage with both USB-A and USB-C connectivity support.
  • Compatible with PCs, Macs, PS4, and PS5 according to the product information.
  • Compact, shock-resistant portable design for carrying files and game storage.
  • 500GB capacity and specified read/write speeds of up to 340MB/s and 320MB/s.
  • Includes a USB Type-A cable and Type-C adapter.
  • Registered devices receive a three-year warranty; unregistered devices receive two years.

Cons

  • Specified transfer speeds of 340MB/s read and 320MB/s write are lower than the ADATA’s stated figures.
  • Mixed feedback mentions a thin plastic shell or low-quality USB construction.
  • Some reviews report data corruption, slowdowns, or support concerns.
  • PS5 extended-storage setup may require extra formatting steps and use of Buffalo’s formatting tool in one review.
  • External PS5 storage is described in the supplied review as suitable for storing and playing PS4 games, not playing PS5 games.
BUFFALO External SSD 500GB

Final verdict

The ADATA Ultimate SU630 480GB is the best overall option in this comparison for a compatible internal PC or notebook upgrade. It earns the higher overall score, has stronger specified 520MB/s read and 450MB/s write performance, and receives consistent praise for making older systems feel faster. Its migration and drive-monitoring tools further suit a hard-drive replacement project.

The BUFFALO External SSD 500GB remains the better purchase for a different job: portable, USB-connected storage. It offers slightly more capacity, USB-A and USB-C flexibility, broader listed device support, and clearer registered warranty coverage. Accept its lower specified speeds and the mixed reliability, shell-quality, and PS5-setup feedback only if external convenience is more important than internal SATA performance. In either case, keep backups of important files.

Overall winner

Depends on your needs

Frequently asked questions

Which is better overall: the ADATA Ultimate SU630 480GB or BUFFALO External SSD 500GB?

The ADATA is the stronger overall choice in the supplied scoring, particularly for performance, speed, value, setup, and customer satisfaction. That conclusion applies most directly to a compatible internal PC or notebook upgrade. The BUFFALO is the better fit when external USB use, broad device compatibility, and portability are more important than the higher stated SATA transfer speeds.

Which SSD is faster?

The ADATA Ultimate SU630 has the higher stated speeds, at up to 520MB/s read and 450MB/s write. The BUFFALO External SSD is specified at up to 340MB/s read and 320MB/s write. Actual results can vary by host device and connection, but the provided specifications and speed score favor the ADATA for compatible SATA installations.

Can the ADATA SU630 be used as an external drive?

The ADATA SU630 is listed as an internal 2.5-inch SATA SSD for PC and notebook use. Its supplied product information does not describe it as a ready-to-use external drive. Buyers seeking direct USB-A or USB-C connection between devices should choose the BUFFALO, which is explicitly sold as an external USB SSD.

Is the BUFFALO External SSD suitable for PS5 storage?

The BUFFALO lists PS4 and PS5 compatibility, but the provided PS5 review adds an important limitation: it describes external storage as suitable for storing and playing PS4 games, rather than playing PS5 games. That review also reports that PS5 setup can require Buffalo’s formatting tool. Check console requirements and intended game use before buying.

Which drive is easier to set up?

For its intended use, the ADATA scores higher for setup and reviews often describe HDD replacement and migration as straightforward. It still requires opening a compatible PC or notebook and installing a SATA drive. The BUFFALO is generally plug-and-play on computers, but supplied feedback indicates that PS5 formatting can involve additional steps.

Which SSD is better for portability?

The BUFFALO is the practical portable choice because it is an external USB drive designed for on-the-go files, backups, and game storage. It supports USB-A and USB-C connections and has a compact form. The ADATA is also light, but it is intended to remain inside a compatible PC or notebook after installation.

Which option has better warranty support?

The BUFFALO has clearer supplied warranty terms: three years for registered devices and two years if unregistered. The ADATA information lists EU spare-part availability for two years, but does not provide equivalent warranty detail in the supplied data. The warranty-support score therefore favors BUFFALO, although buyers should verify local terms before purchase.

Are there reliability concerns with either SSD?

Both products have positive user feedback, but neither is free from caveats in the supplied data. One ADATA review reports failure after several years, contributing to long-term durability uncertainty. BUFFALO feedback is more mixed, with reports of plastic-shell concerns and occasional data corruption or slowdown complaints. Keeping backups remains sensible with either drive.

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