I've always been wary of USB sticks. I have some that write slowly, and the system says still writing. I have others that seem to however it works, return im

I've always been wary of USB sticks. I have some that write slowly, and the system says still writing. I have others that seem to however it works, return immediately like they're super fast, and do writes in the background. Anymore, I just buy the sticks with light indicators. It's not done if it's not pulsing evenly...