VBA check for mdb on diskette?

Here is a procedure I'm trying to write.

Private Sub BtnCopyToDiskette_Click()

'This procedure checks to see if there is a diskette in Drive a:, and if there is, it creates an Access 2000 database on it called
'      "Library Book Requests."  (You can change the name if you wish.)
'      Then the procedure imports the table "Incoming Book Requests" from this database into the database on the diskette.

 Dim fs, d
 Dim dbsNew As Database

 Set fs = CreateObject("Scripting.FileSystemObject")
     If fs.DriveExists("a:") Then
           
       Set d = fs.GetDrive("a:")
     
             If d.IsReady Then
                'Kill "A:\Library Book Requests.mdb"
                MsgBox "The Library Book Request data is being transferred to the diskette. Please wait until the diskette light goes out to proceed."
                Set dbsNew = DBEngine.Workspaces(0).CreateDatabase("A:\Library Book Requests.mdb", dbLangGeneral)
       
        'Export the book request data to the database newly created on the diskette
                 DoCmd.TransferDatabase acExport, "Microsoft Access", "A:\Library Book Requests.mdb", , "Incoming Book Requests", "Incoming Book Requests"
                 dbsNew.Close
                 Set dbsNew = Nothing
                MsgBox "Now if you click on the OK button, the request data will be added to any older request data you've prepared earlier."
                DoCmd.OpenQuery "qap Update Requests Sent With New Request"
                MsgBox "All done"
               
                Else: MsgBox "No diskette is in the floppy drive"
             End If

I need some kind of inner If statement that tests to see if the "Library Book Requests.mdb" exists, and if it does, then it executes the "Kill" statement. If it doesn't exist, then the code would go on to write out the new database as shown here.    

How do I modify this code section to make add the appropriate If-Then, and what is the code for testing for an existing .mdb on this floppy diskette?

Thanks in advance!!!!!