SanDisk makes great flash storage products. But, I really hate the U3 flash drive app software they install on every thumb drive. It has the malware-like behavior of installing itself with asking permission. I even noticed it had installed something called U3agent on my Mac that was chewing up processor resources. I must have missed removing U3 from a SanDisk thumb drive some time in the past. Here's the direct link to the:
It is made available by SanDisk itself. The tool only runs under Microsoft Windows. SanDisk has changed the URL for this tool several times in the last few years. So, it may change again in the future.