Buying an external SSD can seem complicated because manufacturers advertise numbers such as:

1,050MB/s

2,000MB/s

20Gbps

USB 3.2 Gen 2

But those numbers don't tell the whole story.

Here's how to choose the right drive.

1. Start With Capacity

Choose capacity based on what you're storing.

500GB: Basic files

1TB: General creative work

2TB: Video and large libraries

4TB+: Large archives

2. Understand Interface Speed

USB 3.2 supports multiple transfer rates, including 5Gbps, 10Gbps and 20Gbps.

Therefore:

A 20Gbps SSD doesn't automatically run at 20Gbps on every computer.

Your computer port, cable and SSD controller all matter.

3. Check the Cable

This is frequently overlooked.

A high-speed SSD needs a suitable cable to achieve its intended performance.

Don't assume that every USB-C cable provides the same data-transfer capability.

4. Consider Your Workload

If you're mainly storing:

  • Documents
  • PDFs
  • Photos

you may not need the fastest SSD available.

If you're:

  • Editing video
  • Moving large project folders
  • Working with high-resolution footage

higher sustained performance becomes more valuable.

5. Portability

If you travel with the drive, prioritize:

  • Compact design
  • Rugged construction
  • Drop protection
  • Water/dust resistance

6. Security

Some SSDs provide hardware encryption or password-protection features.

This can be valuable if the drive contains:

  • Client files
  • Personal documents
  • Business information

7. Warranty

Always check:

  • Warranty period
  • Regional support
  • Replacement process

A storage device contains important data, so manufacturer support matters.

8. Don't Use One SSD as Your Only Backup

This is one of the most important rules.

If your only copy of your files is on one external SSD, you don't have a proper backup strategy.

Consider:

Working copy + backup copy

For critical files, maintain an additional backup.

Final Verdict

Choose your SSD in this order:

Capacity → Compatibility → Interface → Speed → Durability → Security → Price

Don't reverse that order simply because a product advertises a huge speed number.