How can I get list of all drives but also get the corresponding drive type (removable,local disk, or cd-rom,dvd-rom… etc)?

Question

How can I get list all drives but also get the corresponding drive type (removable,local disk, or cd-rom,dvd-rom... etc)?

Answer 1

If you use JACOB, you can list all drives along with appropriate types:

import com.jacob.activeX.ActiveXComponent;
import com.jacob.com.Dispatch;
import com.jacob.com.EnumVariant;
import com.jacob.com.JacobObject;
import com.jacob.com.Variant;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

public class DrivesExample
{
    public interface HasNativeValue
    {
        int getNativeValue();
    }

    public enum DriveTypeEnum implements HasNativeValue
    {
        Unknown(0),
        NoRootDirectory(1),
        RemovableDisk(2),
        LocalDisk(3),
        NetworkDrive(4),
        CompactDisc(5),
        RAMDisk(6);

        public final int nativeValue;

        DriveTypeEnum(int nativeValue)
        {
            this.nativeValue = nativeValue;
        }

        public int getNativeValue()
        {
            return nativeValue;
        }
    }

    private static <T extends Enum<T> & HasNativeValue> T fromNative(Class<T> clazz, int value)
    {
        for (T c : clazz.getEnumConstants())
        {
            if (c.getNativeValue() == value)
            {
                return c;
            }
        }
        return null;
    }

    /**
     * The drive information.
     */
    public static final class Drive
    {
        /**
         * File system on the logical disk. Example: NTFS. null if not known.
         */
        public final String fileSystem;
        /**
         * Value that corresponds to the type of disk drive this logical disk represents.
         */
        public final DriveTypeEnum driveType;
        /**
         * The Java file, e.g. "C:\". Never null.
         */
        public final File file;

        public Drive(String fileSystem, DriveTypeEnum driveType, File file)
        {
            this.fileSystem = fileSystem;
            this.driveType = driveType;
            this.file = file;
        }

        @Override
        public String toString()
        {
            return "Drive{" + file + ": " + driveType + ", fileSystem=" + fileSystem + "}";
        }
    }

    /**
     * Lists all available Windows drives without actually touching them. This call should not block on cd-roms, floppies, network drives etc.
     *
     * @return a list of drives, never null, may be empty.
     */
    public static List<Drive> getDrives()
    {
        List<Drive> result = new ArrayList<>();
        ActiveXComponent axWMI = new ActiveXComponent("winmgmts://");

        try
        {
            Variant devices = axWMI.invoke("ExecQuery", new Variant("Select DeviceID,DriveType,FileSystem from Win32_LogicalDisk"));
            EnumVariant deviceList = new EnumVariant(devices.toDispatch());
            while (deviceList.hasMoreElements())
            {
                Dispatch item = deviceList.nextElement().toDispatch();
                String drive = Dispatch.call(item, "DeviceID").toString().toUpperCase();
                File file = new File(drive + "/");
                DriveTypeEnum driveType = fromNative(DriveTypeEnum.class, Dispatch.call(item, "DriveType").getInt());
                String fileSystem = Dispatch.call(item, "FileSystem").toString();
                result.add(new Drive(fileSystem, driveType, file));
            }

            return result;
        } finally
        {
            closeQuietly(axWMI);
        }
    }

    private static void closeQuietly(JacobObject jacobObject)
    {
        try
        {
            jacobObject.safeRelease();
        } catch (Exception ex)
        {
            ex.printStackTrace();
        }
    }

    public static void main(String[] arguments)
    {
        List<Drive> drives = getDrives();

        for (Drive drive : drives)
        {
            System.out.println(drive.toString());
        }
    }
}

Example output:

Drive{C:\: LocalDisk, fileSystem=NTFS}
Drive{D:\: LocalDisk, fileSystem=NTFS}
Drive{E:\: RemovableDisk, fileSystem=NTFS}
Drive{F:\: RemovableDisk, fileSystem=FAT32}
Drive{G:\: RemovableDisk, fileSystem=null}
Drive{Y:\: NetworkDrive, fileSystem=NTFS}

To use JACOB, add the JAR and DLL's from the download as libraries in your project. This solution is Windows only of course.