Introduction

Thank you for choosing O&O Defrag 30!
O&O Defrag unlocks the hidden performance of your computer by efficiently and safely consolidating fragmented files. From fully automatic defragmentation to detailed professional settings, O&O Defrag offers everything that defines modern defragmentation software.

With O&O Defrag, you can take the performance of your storage media to a whole new level. Files are organized efficiently, access times are significantly improved, and the lifespan of your hardware is extended.

Why is my PC getting slower?

Over time, computers no longer store files as a whole but in fragments—split into many small pieces scattered across the hard drive or SSD.
This storage chaos significantly increases access times.

Defragmentation reverses this process: files are reassembled and optimally arranged. The result is a noticeably faster and more stable system.

Key Features at a Glance

• Automatic background defragmentation
  O&O Defrag works quietly and efficiently without interrupting your work.

• SSD optimization with SOLID technology
  Specifically developed to improve the performance and lifespan of SSDs—without unnecessary write operations.

• O&O DiskCleaner
  Removes unnecessary files and frees up additional disk space for improved system performance.

• Task scheduling
  Define fixed times for defragmentations that will run automatically.

• Status and performance reports
  Receive detailed analyses of your drives and their optimizations.

• Check & Repair function
  Detects and repairs drive errors to improve data security.

• BitLocker support
  Optimized defragmentation even for encrypted drives—without compromising security.

Welcome to O&O Defrag 30

We are delighted that you have chosen O&O Defrag 30 as your partner for hard disk and SSD optimization.
Discover the advantages of our technologies and enjoy smoother, faster performance—like millions of users worldwide.

Your O&O Software Team
www.oo-software.com

In addition, illustrations in this help may differ slightly from the actual program interface.

O&O Defrag Editions

O&O Defrag is available in two editions:

• O&O Defrag Professional Edition
  For defragmenting a single desktop computer. This edition cannot be used on a server operating system.

• O&O Defrag Server Edition
  Designed for use on server operating systems and optimized for the specific requirements of professional environments.

Installation

To install O&O Defrag, please proceed as follows:

1. Start the computer on which you want to install O&O Defrag.
   
2. Log in as a user with administrative rights.
   
3. Launch the O&O Defrag setup file, either downloaded from our website or found on your installation media.
   
4. Once the setup program has initialized, please follow the installation dialogs.

Install and That’s All
If you downloaded O&O Defrag from our website or purchased it from the online shop, a simplified standard installation is performed. Optimized settings are automatically applied. O&O Defrag is immediately active and works in the background to improve system performance.

For an update or upgrade, you should check the automatic defragmentation settings in case they were previously disabled.

If you do not want a standard installation, click on Advanced Installation in the dialog. This opens the classic installation with all configuration options.

Licensing
To unlock O&O Defrag as the full version after installation, you will need a valid license key (also called registration code, serial number, or product ID).

• At first start, a registration dialog will appear.
  
• Alternatively, you can click Register now in the Info section of the ribbon.
  
• Enter your license information (name, company, license key) exactly as provided in your purchase confirmation.
  
• Be careful not to enter spaces or confuse characters such as “1” and “I.”
  
• Once successfully entered, licensing will be confirmed.

If you encounter problems, please contact our support: support@oo-software.com.

Trial Version
O&O Defrag can be used for 30 days as a free trial version. When starting the program, the registration assistant shows the remaining trial period.

Online Registration
If you purchased the software from the online shop, you are already registered automatically.
If you bought O&O Defrag from a retailer, you can register via the registration assistant.

Requirements:
- Valid license key
- Internet connection

Direct link to the form: www.oo-software.com/register

Benefits of Online Registration:
- Request your license key again if lost
- Receive up-to-date information about our products
- Free minor updates (e.g., Version 30.1 → 30.2)
- Discounted upgrades to new major versions (e.g., Version 29 → 30)
- Access to our customer support
- and much more

Uninstallation
To uninstall O&O Defrag:

1. Open the Settings via the Start menu.
   
2. Click on Apps (Apps & Features).
   
3. Select your edition (Professional or Server) from the list.
   
4. Click Uninstall.
   
5. Follow the uninstallation program.
   
6. Restart the computer if necessary.

Updates
O&O Defrag automatically checks for a new version each time it starts.

• Minor updates (e.g., 30.1 → 30.2) are free of charge.
  
• Major updates (e.g., Version 29 → 30) are subject to a fee.

Tip: Under Info → About O&O Defrag, you can find your license data and the exact program version.

System Requirements

General Requirements - The minimum requirements of the respective operating system must be met
- 64-bit support
- Windows® 10 up to Windows® Server 2025 (all editions)
- ARM platform support

Supported Operating Systems

* All variants of the server operating system are supported.

Network Functionality
If network functionality is to be used, the following is additionally required:
- Network card and connection
- Appropriate access rights

User Rights
- To install and use O&O Defrag, you need local administrative rights.
- In networks, you should be a domain administrator to install and administer O&O Defrag locally and on other computers.

Microsoft Windows Installer
Installation is performed using the built-in Windows Installer, which manages the entire installation and uninstallation process.

Supported File Systems

Supported Storage Media - O&O Defrag supports all hardware components also supported by Windows.
- If the operating system recognizes a partition as a normal Windows partition and it is formatted with a supported file system, it can be defragmented.

Exceptions:
- Removable drives (e.g., tape drives, CD-RWs)
- Network drives as a target for defragmentations

RAID Support - All well-known RAID systems (striped, mirrored, RAID5) are supported.
- Defragmenting RAID volumes is useful because fragmented files distributed across multiple disks cause particularly strong performance losses.

Dark Mode > [!WARNING]
> Note: If the operating system is running in Dark Mode, O&O Defrag’s ModernUI will also automatically adapt to Dark Mode.