List system drive & their total, free, used space in java (example)

Leave a Comment / By Yogesh / December 14, 2016

List all system drives in java.
- We will find out the free (available) , used and total space of each drive.
We will list system drives using File.listRoots api.
Find out the free (available), used and total space of each drive using following methods.

S.No.	API	Description
1	getTotalSpace	Returns the size of the partition named by this abstract pathname.
2	getFreeSpace	Returns the number of unallocated bytes in the partition named by this abstract path name.
3	getUsableSpace	Returns the number of bytes available to this virtual machine on the partition named by this abstract pathname.

We will format the disk space in GB.
- Similarly, we can format disk space in KB or MB.

Program: List system drive & their total, free, used space in java

package org.learn.io;
 
import java.io.File;
 
public class ListDrivesAndSpace {
 
    public static void main(String[] args) {
 
        double GB = 1024D * 1024D * 1024D;
        //Format drive space as per your need
        //double MB = 1024D * 1024D;
        //double KB = 1024D;
 
        File[] listDrives = File.listRoots();
        System.out.println("Listing System drives:");
        for(File drive: listDrives) {
            System.out.printf("Drive: %s\n",drive);
            System.out.printf("Total Space: %f GB\n",drive.getTotalSpace()/GB);
            System.out.printf("Free Space: %f GB\n",drive.getFreeSpace()/GB);
            System.out.printf("Usable Space: %f GB\n\n",drive.getUsableSpace()/GB);
        }
    }
}

Output: List system drive & their total, free, used space in java

Listing System drives:
Drive: C:\
Total Space: 234.728512 GB
Free Space: 186.074795 GB
Usable Space: 186.074795 GB
 
Drive: D:\
Total Space: 120.236324 GB
Free Space: 104.201542 GB
Usable Space: 104.201542 GB
 
Drive: E:\
Total Space: 120.971676 GB
Free Space: 67.195110 GB
Usable Space: 67.195110 GB