Find what is creating folders on SD card I got two useless folders on /sdcard/ (baidu and baiduMapSDK) and even though I delete them, they will generate automatically. How can I know which application or which process created these two folders?
Baidu is the Chinese competitor of Google. I can't but notice your nickname Leng sounds Chinese as well!

So my bet goes to your phone having Chinese apps, including one related to the Baidu search engine.

These folders are definitely being made by this app.

These folders also might not be empty; content which starts with a .dotBeforeName is hidden, and won't show in most file navigators.

My recommendation is to leave those folders be. If you want to get rid of them, you'll also have to uninstall these Baidu apps.