What are these files and folders? .Trashes, .fseventsd, and .Spotlight-V100. When I connect my storage devices to window computer after connecting with mac pro ; this happens....... any free solution?

Whenever I use my any of the storage devices windows based computer in my library, it shows .Trashes, .fseventsd, and .Spotlight-V100 ......

What are these files and folders for? are these virus files? These files only showed up each time if I have connected my storage device to my mac pro....

Please help to find the solution if (or not) it is a virus....

Please suggest some free solution..... I appreciate your help....