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import java.io.*;

class Main {
    public static void main(String[] args) {
        File[] roots = File.listRoots();
        System.out.println("All System Root Directories:");
        for (int i = 0; i < roots.length; i++) {
            System.out.println(roots[i].toString());
        }
    }
}

All System Root Directories:
C:\
D:\
E:\
F:\
G:\
H:\