After unpacking we connected the USB flash drive to a USB3.0 port. You will get around 58.1GB of useable empty free space.

Passing to the performance tests, the ATTO Disk Benchmark reports around 130MB/sec reading and up to 18MB/sec writing speeds.

The CrystalDiskMark software reports higher performance, even those RND4K writing scores are very low...

While the AJA System Test benchmark also reports around 126MB/sec reading and 14MB/sec writing speeds.

The KIOXIA TransΜemory U366 64GB USB Flash drive has metal contstruction and feels premium in the hand. it has a nice keyring to carry it everyday with your other keys. The performance is good, provided that you are writing/reading big files and not small files, since writing performance with small files seems to be low. The USB flash drive is armed with KIOXIA's 5years of limited warranty and if you can find available around 10Euro you should consider buying it.