Rank #5 in Best 512GB MicroSD Card 2026: 10 Ranked, and Why Read Speed Misleads
SanDisk Ultra 512GB microSD Card + Adapter
Price and rating as shown on Amazon when we collected them. Both change.
The SanDisk Ultra microSDXC card sits fifth in this guide: 512GB for £87.97, rated 4.6 out of 5 from 132,166 ratings. On a list built around the gap between read and write speed, this is the entry that does not quote a write speed at all. The figure "Up to 150MB/s" appears in the title, in the bullet promising "Transfer Speeds of up to 150MB/s", and twice in the spec table — once as "Read Speed" and again as "Media Speed". Nowhere does the listing say how fast the card writes.
The smaller inconsistencies are worth knowing too. The spec table calls it Class 10, while the title calls it UHS-I, C10, U1 and A1 — separate labels for the same card. The "Colour" field reads "Up to 150 MB/s". One bullet promises "capacities of up to 1.5TB", which is the range rather than this 512GB card. And the same listing gives two sets of dimensions: 15L x 11W millimetres, and 15D x 10W x 1H centimetres. Everything on this page comes from the Amazon listing, not from any testing of our own.
How those 132,166 ratings break down
An average hides its own shape. This is the spread behind the 4.6 stars.
Specification
Exactly as published on the Amazon listing, field for field.
| Price | £87.97 |
|---|---|
| Rating | 4.6 out of 5 from 132,166 ratings |
| Advertised read speed | Up to 150 MB/s, stated twice — as "Read Speed" and as "Media Speed" |
| Advertised write speed | Not stated anywhere in the listing |
| Speed class as listed | Class 10 in the spec table; the title also says UHS-I, C10, U1 and A1 |
| Capacity | 512 GB (a bullet quotes "capacities of up to 1.5TB" for the range) |
| Colour (as listed) | Up to 150 MB/s |
| Item dimensions (as listed) | 15L x 11W millimetres — the same listing also gives 15D x 10W x 1H centimetres |
What buyers actually say
Quoted from customer reviews on Amazon
Verified purchase“Tested capacity and it is as listed. Recommend seller”
Verified purchase“Works as intended, fits all my music for my phone!”
What it is up against
The rivals it was ranked against in Best 512GB MicroSD Card 2026: 10 Ranked, and Why Read Speed Misleads.
Questions people ask
How fast does the SanDisk Ultra 512GB write?
The listing does not give a write speed. The only speed figure it repeats is "Up to 150MB/s", labelled both "Read Speed" and "Media Speed".
What speed class is this card?
The spec table lists "Secure Digital Association Speed Class: Class 10", while the product title lists C10, U1 and A1.
Is the capacity really 512GB?
The spec table says 512 GB, and one reviewer writes that they tested the capacity and it is as listed. One bullet, however, talks about "capacities of up to 1.5TB", which refers to the card range rather than this one.
What devices is it compatible with?
The listing says SanDisk Ultra microSDHC and microSDXC UHS-I cards are compatible with Android smartphones and tablets, and lists Compatible Devices as Smartphone, Tablet.
Does it include an adapter?
Yes — the product title reads "SANDISK Ultra microSD Card + Adapter 512GB".
What warranty does it carry?
The listing states "Warranty Type: Limited" with no duration, and separately lists an EU Spare Part Availability Duration of 10 years.
Comments
Reader comments are not checked against the manufacturer's claims above.
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