There is about 1GB to 1.5GB that writes at 90MB/s, the rest only writes at 4-6MB/s. The read speeds are above 200MB/s as advertised.

I am not an expert in USB drives, but found this drive to be sufficiently fast and a good price considering the spec level. Another reviewer commented that it wasn't as fast as advertised but I'm not too sure about that. It came in FAT32 format which was useful for me because of what I was using it for. Perhaps people looking to store over 4gb files should be aware they may have to do some simple formatting before using this drive. I'm no expert so I could be wrong about that. Overall, would recommend.

Very happy with this product. Very well priced for its capacity, compact and robust design. Haven’t had any issues with speed.

Very sleek design not thinking it was going to fit in the USB slot but it did & with style. Seems to work well and is solidly constructed so expect to last.

Perfectly suited the needs for my use case. Slim design makes it easy to attach to things like your keychain without being intrusive. Comes at a fantastic price considering things like storage capacity and build quality.