After unpacking we connected the microSD to an external SD/MicroSD reader and connected it to a USB3.0 port. You will get around 238GB of usable empty free space and with exFAT file system.

Passing to the performance tests, the ATTO Disk Benchmark reports around 95MB/sec reading and 86Mb/sec writing speeds after 128Kb files.

While the ATTO Disk Benchmark 4.01.0f1 gave slight lower numbers.

The CrystalDiskMark software reports slight higher performance

While the AJA System Test benchmark also reports around 91MB/sec reading and 81MB/sec writing speeds with 1GB test file size.

- Conclusion

The Samsung 256GB Pro Endurance MicroSD is the answer for industrial use or applications that demand many read/writes. The performance of the Samsung 256Pro Endurance is par with the specifications and the price ranges around $29.99 (reduced price, original price $55) and comes with 5 year of warranty, at least for the 256GB variant. We have no problem suggesting this microSD if you are in the market for a heavy use MicroSD. For sure we would like Samsung to further boost Pro Endurance capacities for those heavy sized demanding users.