How to choose an external SSD: capacity and speed

An external SSD is chosen primarily by storage capacity, then by read and write speeds. Performance varies considerably between models, with transfer rates ranging from single to fivefold. Price typically follows these two criteria.

What to check

Storage capacity Capacity determines the volume of data you can store on the drive. In today’s market, entry-level models offer two hundred and fifty-six gigabytes, while half of all products provide two terabytes or more. The most generous reach eight terabytes. The rating bar positions each product on this scale: the longer it is, the more space available. Match your choice to your actual needs, whether for regular backups, media libraries, or occasional transfers of professional files. Market median: 2,000 GB

Read speed Read speed measures how quickly the SSD transfers your files to your computer or device. The slowest models deliver around four hundred and fifty megabytes per second, the median sits at approximately one thousand and fifty megabytes per second, and the fastest reach three thousand eight hundred megabytes per second. This difference is immediately noticeable when opening large files or copying substantial libraries. The bar displayed on each product page reflects this positioning: the longer it is, the faster the transfer. Market median: 1,050 MB/s

Write speed Write speed indicates how quickly the SSD records your data from your device to the disk. Performance ranges from four hundred and forty megabytes per second for basic models to three thousand seven hundred megabytes per second for the most capable, with a median at one thousand megabytes per second. This characteristic matters particularly if you regularly back up large volumes or work directly on the drive. The site’s rating positions each product on this scale: a longer bar signals faster recording. Market median: 1,000 MB/s

Compatibility and connection Check that your computer or device has the appropriate port to connect the external SSD. Most recent models use modern USB connectors, but not all ports deliver the same speeds. A fast SSD will only reveal its performance if your machine’s port allows it. Some products include multiple cables to adapt to different equipment. Also consider supported operating systems, although most SSDs work across major platforms after possible formatting.

Benchmarks based on 30 recent market listings, collected on 4 October 2026.

What you get for each budget

Under €80

This range provides access to SSDs with modest capacity, typically around two hundred and fifty-six gigabytes, with read and write speeds in the lower market bracket.

€80 to €200

You’ll find capacities of one or two terabytes here and transfer speeds close to the median, around one thousand megabytes per second for both read and write, offering good balance for regular use.

Over €200

This bracket includes the most spacious models, up to eight terabytes, and the fastest, often exceeding three thousand megabytes per second in both read and write, for intensive or professional use.