# SanDisk Ultra 128GB SDXC Card (140MB/s, U1)

Source: https://www.ranked10.co.uk/tech/best-128gb-sd-cards/sandisk-ultra-128gb-sd
Ranked #7 in "Best 128GB SD Cards 2026: 10 Ranked, and Three Adverts That Contradict Themselves": https://www.ranked10.co.uk/tech/best-128gb-sd-cards

- Price: £25.49 (checked on Amazon UK on 2026-09-19)
- Amazon rating: 4.6 from 11,929 ratings
- Buy on Amazon: https://www.amazon.co.uk/dp/B0B7NS71G2?tag=ranked10-21

The SanDisk Ultra 128GB sits at number seven in this guide. It is a UHS-I SD card aimed at compact and mid-range point-and-shoot cameras rather than at burst shooting, and the number it leads with is read speed: up to 140MB/s when offloading files to a computer.

The advert then qualifies that 140MB/s in two separate places. The speed bullet says the figure is "engineered with proprietary technology to reach speeds beyond UHS-I 104MB/s" and requires compatible devices, and the accessory bullet names the SanDisk SD UHS-I card reader, sold separately. Further down the same listing the spec field labelled Media Speed reads 10 MB/s — fourteen times lower than the headline number, with nothing in the advert to explain the gap. Every figure on this page comes from the Amazon listing, not from testing of our own.

## Specification

| Field | Value |
|---|---|
| Price | £25.49 |
| Rating | 4.6 out of 5, from 11,925 ratings |
| Advertised read speed | 140 Megabytes Per Second (UHS-I) |
| Media Speed (as listed) | 10 MB/s |
| Capacity | 128 GB (1GB=1,000,000,000 bytes. Actual user storage less.) |
| Speed class | UHS Speed Class 1 (U1), Class 10, for Full HD 1080p video |
| Reader needed for full speed | SanDisk SD UHS-I card reader, sold separately |
| Box Contents (as listed) | Installation hardware |

## Questions people ask

**What read speed does the SanDisk Ultra 128GB advertise?**

Up to 140MB/s, which the listing describes as engineered with proprietary technology to reach speeds beyond UHS-I 104MB/s, and as requiring compatible devices capable of reaching such speeds.

**Is a write speed given for this card?**

No write figure appears in the bullets or the speed class fields. The only other speed number in the advert is the Media Speed field of 10 MB/s, which sits in the same listing as the 140MB/s read figure.

**Do I need anything extra to reach 140MB/s?**

The SanDisk listing states that speeds beyond UHS-I 104MB/s need compatible devices, and it names the SanDisk SD UHS-I card reader, which it says is sold separately.

**How much can it store?**

Up to 128GB, with the listing noting 1GB=1,000,000,000 bytes and that actual user storage is less.

**What video is it rated for?**

The SanDisk Ultra carries UHS Speed Class 1 (U1) and Class 10 ratings, which the listing states support real time recording of Full HD 1080p video with UHS enabled host devices.

**What does the box contain?**

The Box Contents field in this listing reads "Installation hardware", which is what the advert states for an SD card.

**What devices is it for?**

The listing describes it as a choice for compact to mid-range point-and-shoot cameras, and lists Compatible Devices as Camera.