Samsung has begun sampling 256GB SD Express microSD cards that achieve write speeds of up to 800MB/s. The company plans to start selling the cards sometime later this year.

Samsung has unveiled the first microSD cards with support for sequential read speeds as high as 800 MB/s later. That’s two to three times as fast as the speediest UHS-II SD cards available today ...

Speedy “SD Express” cards have gone nowhere for years, but Samsung could change that Compatibility issues and thermals have, so far, kept SD Express from taking off.

The Galaxy Express 2 takes some of the best bits from high-enders like Samsung's S5 and S4 and reduces them enough to produce a midrange handset that looks like something considerably more expensive.

A pair of devices -- the MiFi Liberate hot spot and Samsung's Galaxy Express Android smartphone -- join the carrier for under $100.