using System; //Standard libary that comes with every c# compiler

using System.IO; //Import directory libary

using System.Collections.Generic; //Libary for things like lists

using System.Linq; //Libary to convert arrays to lists ect

public class Program

{

    public static void Main()

    {   

        //An empty list for later to collect strings

        List<string> file = new List<string>(); 

        //extract primary drives strings into a list since there could be more than just C:\

        DriveInfo[] allDrives = DriveInfo.GetDrives(); 

​

        /*Loop though all root drives where "d" is each drives info and "DriveInfo" is really an object with a unique name.

        Inplace of DriveInfo you could also do looks for strings, intergers or boleans for example*/

        foreach (DriveInfo d in allDrives) 

        {

            //The d.Name output has "Drive C:\" as the output. remove the "Drive " part first

            var replacement = d.Name.Replace("Drive ", "");

            /*Grab each files location with the Directory tool from the earlier IO libary.

            GetFiles is a subcommand of directory with options in the brackets. These

            options can be found in more detail by seaching for GetFiles C#*/

            string[] files = Directory.GetFiles(replacement, "*.*", SearchOption.AllDirectories);

            //Convert the array to a list

            List<string> templist = files.ToList();

            //Add them to the earlier empty list we made

            file.AddRange(templist);

        }

        //Now that we have paths to all the files we need we can now compress them

        foreach (string d in file)

        {

            //Find a video compressor libary and compress each video

        }

    }

}