filesystems - identify file system format of a disk type in java like ntfs, fat16/32 or ext

Question

Is there any way to find out the file system format of a disk in java?

For example for a windows hard drive it could be NTFS, for zip drives it is FAT32.

Answer 1

N.B. This is only valid for Java running on Windows system:

Using JNA, you can call Win32 Kernel32's GetVolumeInformation() to retrieve lpFileSystemNameBuffer parameter which receives the name of the file system, for example, the FAT file system or the NTFS file system http://msdn.microsoft.com/en-us/library/windows/desktop/aa364993(v=vs.85).aspx

Kernel32.java:

package filesystem;


import java.util.HashMap;
import java.util.Map;

import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.platform.win32.WinDef.DWORD;
import com.sun.jna.ptr.IntByReference;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIFunctionMapper;
import com.sun.jna.win32.W32APITypeMapper;

public interface Kernel32 extends StdCallLibrary {

    final static Map<String, Object> WIN32API_OPTIONS = new HashMap<String, Object>() {

        private static final long serialVersionUID = 1L;

        {
            put(Library.OPTION_FUNCTION_MAPPER, W32APIFunctionMapper.UNICODE);
            put(Library.OPTION_TYPE_MAPPER, W32APITypeMapper.UNICODE);
        }
    };

    public Kernel32 INSTANCE = (Kernel32) Native.loadLibrary("Kernel32", Kernel32.class, WIN32API_OPTIONS);

    /*
    BOOL WINAPI GetVolumeInformation(
            __in_opt   LPCTSTR lpRootPathName,
            __out      LPTSTR lpVolumeNameBuffer,
            __in       DWORD nVolumeNameSize,
            __out_opt  LPDWORD lpVolumeSerialNumber,
            __out_opt  LPDWORD lpMaximumComponentLength,
            __out_opt  LPDWORD lpFileSystemFlags,
            __out      LPTSTR lpFileSystemNameBuffer,
            __in       DWORD nFileSystemNameSize
            );
     */
    public boolean GetVolumeInformation(
            String lpRootPathName,
            char[] lpVolumeNameBuffer,
            DWORD nVolumeNameSize,
            IntByReference lpVolumeSerialNumber,
            IntByReference lpMaximumComponentLength,
            IntByReference lpFileSystemFlags,
            char[] lpFileSystemNameBuffer,
            DWORD nFileSystemNameSize
            );

    public int GetLastError();
}

VolumeInformation.java:

package filesystem;

import ping.Kernel32;

import com.sun.jna.platform.win32.WinDef.DWORD;
import com.sun.jna.ptr.IntByReference;

public class VolumeInformation {

    static void getFileSystemName(){
        char[] lpVolumeNameBuffer = new char[256];
        DWORD nVolumeNameSize = new DWORD(256);
        IntByReference lpVolumeSerialNumber = new IntByReference();
        IntByReference lpMaximumComponentLength = new IntByReference();
        IntByReference lpFileSystemFlags = new IntByReference();

        char[] lpFileSystemNameBuffer = new char[256];
        DWORD nFileSystemNameSize = new DWORD(256);

        lpVolumeSerialNumber.setValue(0);
        lpMaximumComponentLength.setValue(256);
        lpFileSystemFlags.setValue(0);

        Kernel32.INSTANCE.GetVolumeInformation(
                "C:", 
                lpVolumeNameBuffer, 
                nVolumeNameSize, 
                lpVolumeSerialNumber, 
                lpMaximumComponentLength, 
                lpFileSystemFlags, 
                lpFileSystemNameBuffer, 
                nFileSystemNameSize);

        System.out.println("Last error: "+Kernel32.INSTANCE.GetLastError()+"

");

        String fs = new String(lpFileSystemNameBuffer);
        System.out.println(fs.trim());

    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        getFileSystemName();
    }

}