# SanDisk Ultra 128GB USB 3.0 Flash Drive

Source: https://www.ranked10.co.uk/tech/best-128gb-usb-flash-drives/sandisk-ultra-128gb-flash-drive
Ranked #1 in "Best 128GB USB Flash Drives: 10 Ranked, and the Write Speeds the Boxes Hide": https://www.ranked10.co.uk/tech/best-128gb-usb-flash-drives

- Price: £18.79 (checked on Amazon UK on 2026-09-18)
- Amazon rating: 4.6 from 210,343 ratings
- Buy on Amazon: https://www.amazon.co.uk/dp/B00P8XQPY4?tag=ranked10-21

The SanDisk Ultra 128GB takes the top spot in this guide because it is the drive whose read and write numbers stay apart. The listing quotes 130 MB/s read and then, in a separate specification field, 80 MB/s write — the split you would expect from a USB 3.0 stick, and the reason it sits above listings that print one headline figure and copy it into both fields.

It is a 128 GB USB 3.0 flash drive, black, priced at £18.79, rated 4.6 out of 5 from 210,343 ratings. The rating bars in the listing split 77 five-star, 16 four-star, 4 three-star, 1 two-star and 2 one-star, which adds up to 100 bars rather than 210,343 ratings — a reminder that the percentages on the page and the review count measure different things. Everything on this page is taken from the Amazon listing: its specification fields, its bullets and its customer reviews. We have not tested the drive, and the numbers below are SanDisk's, not ours.

## Specification

| Field | Value |
|---|---|
| Price | £18.79 |
| Amazon rating | 4.6 out of 5 from 210,343 ratings |
| Rating breakdown (as listed) | 77 five-star, 16 four-star, 4 three-star, 1 two-star, 2 one-star — the bars total 100 |
| Read speed | 130 MB/s |
| Write speed | 80 MB/s |
| Capacity | 128 GB |
| Hardware interface | USB 3.0 |
| Hardware connectivity technology (as listed) | USB 3.0 Micro A |

## Questions people ask

**What read and write speeds does the SanDisk Ultra 128GB quote?**

The listing gives 130 MB/s read and, in a separate specification field, 80 MB/s write. The write figure is not repeated from the read figure, which is what makes this one the straight comparison in the guide.

**Why does the same listing claim up to 10x faster than standard USB 2.0?**

Standard USB 2.0 runs at 480 Mbps, roughly 60 MB/s, so 10x would be around 600 MB/s — well above the 130 MB/s read speed SanDisk gives for this drive in its own specification field. The two figures come from the same page and do not agree.

**Is the full 128 GB available for files?**

The listing states a memory storage capacity of 128 GB and does not quote a formatted capacity. One reviewer's summary is simply that it has the capacity stated.

**What can I plug it into?**

The listing says compatible devices are any device with a USB port, and lists Apple and Android under compatible phone models. Two reviewers describe using theirs with a television.

**Does it encrypt files?**

Yes. The listing says the SanDisk Ultra password-protects and encrypts private files with SanDisk SecureAccess software.

**How has it been rated?**

4.6 out of 5 from 210,343 ratings, with the listing's own breakdown showing 77 bars at five stars and 2 at one star.