Java File IO - Listing all drives with type, total space and free space

In Java File I/O programming, to list all available drive partitions on computer, we can use the following code snippet:

File[] drives = File.listRoots();
if (drives != null && drives.length > 0) {
	for (File aDrive : drives) {
		System.out.println(aDrive);
	}
} 

The above code snippet would produce the following output (e.g. on Windows platform):

C:\
D:\
E:\
F:\ 

The output may vary, depending on system configuration and platform, e.g. there would be only one root partition “\” on a Linux/Unix system.

Getting type description of a drive:

To know which type (hard disk, CD-ROM, flash drive, etc) of a drive, we can use the method getSystemTypeDescription(File) provided by the FileSystemView class in the javax.swing.filechooser package. For example:

FileSystemView fsv = FileSystemView.getFileSystemView();
String driveType = fsv.getSystemTypeDescription(aDrive);

Getting total space and free space of a drive:

Since Java 1.6, we can know the total space and free space of a drive partition by using the getTotalSpace() and getFreeSpace() methods, respectively. These methods return the spaces in bytes. For example:

• On Windows:
  

  File aDrive = new File("C:");
  
  long freeSpace = aDrive.getFreeSpace();
  long totalSpace = aDrive.getTotalSpace();

   

• On Linux/Unix:
  

  File aDrive = new File("\\");
  
  long freeSpace = aDrive.getFreeSpace();
  long totalSpace = aDrive.getTotalSpace();

   

Java Listing Drivers Example Program:

The following program lists all available drive partitions with their drive letters, type descriptions, free spaces and total spaces:

package net.codejava.io;

import java.io.File;

import javax.swing.filechooser.FileSystemView;

/**
 * 
 * @author www.codejava.net
 *
 */
public class DrivesListingExample {

	public static void main(String[] args) {
		
		FileSystemView fsv = FileSystemView.getFileSystemView();
		
		File[] drives = File.listRoots();
		if (drives != null && drives.length > 0) {
			for (File aDrive : drives) {
				System.out.println("Drive Letter: " + aDrive);
				System.out.println("\tType: " + fsv.getSystemTypeDescription(aDrive));
				System.out.println("\tTotal space: " + aDrive.getTotalSpace());
				System.out.println("\tFree space: " + aDrive.getFreeSpace());
				System.out.println();
			}
		}
	}
} 

Sample output on Windows:

Drive Letter: C:\
	Type: Local Disk
	Total space: 73402363904
	Free space: 11994337280

Drive Letter: D:\
	Type: Local Disk
	Total space: 106151542272
	Free space: 84617833472

Drive Letter: E:\
	Type: Local Disk
	Total space: 106232282624
	Free space: 70415875072

Drive Letter: F:\
	Type: CD Drive
	Total space: 0
	Free space: 0

Sample output on Unix/Linux:

Drive Letter: /
	Type: null
	Total space: 30829133824
	Free space: 22259314688 

Other Java File IO Tutorials:

• How to Read and Write Text File in Java
• How to Read and Write Binary Files in Java
• Java IO - Common File and Directory Operations Examples
• Java Serialization Basic Example
• Understanding Java Externalization with Examples
• How to execute Operating System Commands in Java
• 3 ways for reading user's input from console in Java
• File change notification example with Watch Service API
• Java Scanner Tutorial and Code Examples
• How to compress files in ZIP format in Java
• How to extract ZIP file in Java

About the Author:

Nam Ha Minh is certified Java programmer (SCJP and SCWCD). He began programming with Java back in the days of Java 1.4 and has been passionate about it ever since. You can connect with him on Facebook and watch his Java videos on YouTube.

Attachments:

DrivesListingExample.java

[Example program]

0.7 kB