O&O Defrag 20 User Interface (GUI) O&O Defrag 20 US$ 29.95 Buy now The main view of O&O Defrag consists of the following components: O&O Defrag: User Interface Key: Ribbon Bar Drive list Cluster View (see Figure) Time view History Drive status File status Read next:Drive List Cluster View Defragmentation summary Job View and Reports Status Views Tray icon (Notification area icon)