Firstly, create an instance of DriveInfo −
DriveInfo dInfo = new DriveInfo("E");
Display free space −
Console.WriteLine("Disk Free space = {0}", dInfo.AvailableFreeSpace);
Now, use AvailableFreeSpace property and get the percentage of free space −
Double pc = (dInfo.AvailableFreeSpace / (float)dInfo.TotalSize) * 100;
Here, you will get the percentage of free size in comparison with the total disk space −
Console.WriteLine("\n Free space (percentage) = {0:0.00}%.", pc);