# Amazon Basics 512GB microSDXC Card with Adapter

Source: https://www.ranked10.co.uk/tech/best-512gb-microsd-cards/amazon-basics-512gb-microsdxc
Ranked #7 in "Best 512GB MicroSD Card 2026: 10 Ranked, and Why Read Speed Misleads": https://www.ranked10.co.uk/tech/best-512gb-microsd-cards

- Price: £93.93 (checked on Amazon UK on 2026-09-15)
- Amazon rating: 4.6 from 7,547 ratings
- Buy on Amazon: https://www.amazon.co.uk/dp/B08TJTCCV8?tag=ranked10-21

The Amazon Basics 512GB microSDXC is a microSDXC card from Amazon's own brand, sold with a full-size adapter and listed at £93.93. It sits at number seven in this guide, with a 4.6 rating from 7,547 reviews. The title leads with "A2, U3, Read Speed up to 100 MB/s", and the fourth bullet repeats that read figure as "Up to 100MB/s read speed (lab-tested)".

What the listing does not do is keep its own numbers straight. Lower down the same page, the specification table lists "Media Speed: 90" — no unit, no explanation of how it relates to the 100 MB/s above it. The speed class splits the same way: the bullet says "UHS-I U3 + A2 Certified", while the spec table's Secure Digital Association Speed Class field says "Class 10". Two claims, two different figures, and nothing on the page reconciles them. Neither of them is a write speed, so neither answers the question this guide keeps returning to: what the card does when a 4K recording runs long. The second bullet is unusually frank about the other number buyers care about, giving usable capacity as ≥465GB against a 512GB label. Everything on this page is taken from the Amazon listing itself, not from any test of our own.

## Specification

| Field | Value |
|---|---|
| Price | £93.93 (as listed) |
| Rating | 4.6 out of 5, from 7,547 ratings |
| Advertised read speed | Up to 100 MB/s, described as lab-tested in the title and fourth bullet |
| Media Speed (spec table) | 90 (as listed, with no unit given) |
| Speed class | Class 10 in the spec table; UHS-I U3 in the bullet (as listed) |
| Video Speed Class | V30, stated in the fourth bullet |
| Capacity | 512GB labelled, ≥465GB usable per the second bullet |
| Endurance ratings | Shock-resistant, IPX6 water-resistant, −10°C to +80°C, X-ray and magnetic resistant |

## Questions people ask

**What read speed does the Amazon Basics 512GB microSDXC advertise?**

The title says "Read Speed up to 100 MB/s" and the fourth bullet calls it "Up to 100MB/s read speed (lab-tested)". The specification table on the same page also lists "Media Speed: 90".

**Is a write speed given anywhere on this listing?**

No. The listing gives read speed, the U3, A2 and V30 ratings, and a "Media Speed" entry of 90 in the spec table, but no write speed figure in MB/s.

**What speed class is this card?**

The bullet says "UHS-I U3 + A2 Certified", while the specification table lists the Secure Digital Association Speed Class as "Class 10". The listing does not reconcile the two.

**How much of the 512GB is actually usable?**

Amazon Basics' own bullet gives usable capacities for the range: 512GB labelled, ≥465GB usable, which it attributes to OS formatting and binary/decimal calculation differences.

**Does it work in a Nintendo Switch?**

The first bullet says it is compatible with Nintendo Switch, and states explicitly that it is not for Nintendo Switch 2. The same bullet advises checking your device's maximum supported capacity.

**What conditions is the Amazon Basics 512GB microSDXC rated for?**

Shock-resistant, IPX6 water-resistant, rated from −10°C to +80°C, and resistant to X-rays and magnetic fields, according to the fifth bullet.