Error message when saving to a:\ drive when no disk present

Question

I am using a Jfilechooser andsaving images using ImageIO, but I want add in the code necessary to display an error message when the user tries to save to the a:\ drive but there is no disk present. How would I do this, this is the code so far:
JFileChooser chooser = new JFileChooser();
chooser.setApproveButtonMnemonic('a');
chooser.setApproveButtonText("Save");
// create a file chooser with save dialog
int returnVal = chooser.showSaveDialog(c);
// If the user selects ok
if (returnVal == JFileChooser.APPROVE_OPTION) {
// Get the file the user selected
File file = chooser.getSelectedFile();
/ Get the name of the selected file
String name = file.getName();
     // Set the format name to null
String formatName = null;
// Get the index number of when the . occurs in the file name
int dot = name.indexOf(".");
     try {
     if(dot == -1) {
     file = new File(file.getParentFile(),
name + "." + defaultExtension);
     formatName = defaultExtension;
     else {
// else get the format name using a substring.
     formatName = name.substring(dot+1);
     // If the image cannot be saved, display an error message.
     if(!ImageIO.write(bi, formatName, file)) {
     file.delete();
     JOptionPane.showMessageDialog(c,
     "The image could not be saved. Please ensure that the extension is .jpg or .png",
     "Image save failed",
     JOptionPane.ERROR_MESSAGE);
     else {          // The image can be saved, so display a confirmation message
     JOptionPane.showMessageDialog(c,
     "The image has been saved to:\n"+
     file.getPath(),
     "Image Saved",
     JOptionPane.INFORMATION_MESSAGE);
     catch(IOException e) {               // Display an error message if save fails.
     JOptionPane.showMessageDialog(c,
     "The image could not be saved, no space on disk!!\n" + e,
     "Image save failure",
     JOptionPane.ERROR_MESSAGE);

Answer 1

Again I have tried this, but in my program if I try to save to the a drive when no disk is inserted, the JOptionPane i want to display is not coming up.
the system prints out
java.io.FileNotFoundException: A:\image.jpg <The device is not ready>
If that makes any sense to you