TRANSCEND HIGH ENDURANCE
£34 inc VAT (64GB) • uk.transcend-info.com
Most microSD cards use TLC flash storage, which is the cheapest type. Transcend is keen to point out that its High Endurance microSDXC card uses MLC storage, which stores fewer bits per cell and is more reliable (and more expensive). It’s designed for continuous recording in dash cams and security cameras rather than for super-high speeds.
So it wasn’t too surprising to see relatively pedestrian read and write speeds from this Class 10 card: 23MB/s when reading and 20.9MB/s when writing sequentially. That’s double the minimum write speed required for a Class 10 card, and plenty for Full HD recording. For random 4KB read and writes, it managed 5.7MB/s and 1.3MB/s respectively. Not great, but then again, this isn’t designed for phone or tablet use. Oddly, though, the card has only a two-year warranty, while some rivals, notably SanDisk, offer a lifetime warranty. Indeed, Transcend’s own Ultimate range of microSD cards has a lifetime warranty.
The other problem is price: you pay quite the premium for this high endurance: it equates to about 55p per GB.