Every laptop is one lost bag or stolen car away from a potential data breach. Without encryption, anyone who gets hold of your laptop can simply remove the hard drive, plug it into another computer, and read every file on it — regardless of your Windows password. BitLocker eliminates this risk entirely by encrypting the entire drive at the hardware level.
BitLocker is exclusive to Windows 11 Professional. If you are running Windows 11 Home, you will not have access to it. GetRenewedTech offers Windows 11 Pro for €21.99 — a small cost for the protection BitLocker provides. This guide covers everything you need to know to get BitLocker running properly.
What Is BitLocker and How Does It Work?
BitLocker uses AES (Advanced Encryption Standard) encryption — the same standard used by governments and financial institutions — to scramble every bit of data on your drive. The encryption key is tied to your device’s Trusted Platform Module (TPM) chip, which most modern computers include.
When you start your computer normally, the TPM verifies that the system has not been tampered with and automatically unlocks the drive as part of the boot process. If someone removes the drive or boots from a different device, the TPM is not present to provide the key, and the drive remains completely inaccessible.
Checking Whether Your Device Has a TPM
Before enabling BitLocker, confirm your device has a TPM chip (version 1.2 or higher, though 2.0 is recommended). Press Windows + R, type tpm.msc, and press Enter. The TPM Management console will either confirm your TPM status and version, or state that no TPM was found.
If you have no TPM, BitLocker can still work but requires additional configuration to use a USB startup key instead. This is less convenient but still provides full encryption.
Enabling BitLocker on Your System Drive
Follow these steps to encrypt your primary Windows drive (typically C:):
- Open the Start menu and type BitLocker. Select Manage BitLocker from the results.
- In the BitLocker Drive Encryption window, click Turn On BitLocker next to your system drive.
- Windows will check your system configuration and may ask you to prepare your drive. Follow any on-screen instructions.
- You will be prompted to choose how to unlock your drive at startup. For most users with a TPM, the default option (having the drive unlock automatically during normal boot) is appropriate.
- Next, choose how to back up your recovery key. This is critically important — see the section below for details.
- Choose between encrypting used disk space only (faster, suitable for a new installation) or encrypting the entire drive (slower but more thorough, recommended for existing systems with data).
- Choose your encryption mode. For a fixed internal drive, select New Encryption Mode (XTS-AES). For external drives that may be used on older systems, choose Compatible Mode.
- Click Start Encrypting. The process runs in the background and you can continue using your computer while it completes.
Saving Your Recovery Key — Do Not Skip This Step
The recovery key is a 48-digit numerical code that unlocks your drive if something prevents the normal unlock process — a hardware change, a BIOS update, or forgotten PIN. Losing access to the recovery key could mean permanently losing access to your encrypted data if something goes wrong.
Windows offers four options for saving the recovery key:
- Save to Microsoft account — Stored in the cloud; accessible from any device at account.microsoft.com/devices/recoverykey. Convenient but requires internet access to retrieve.
- Save to a USB flash drive — Stores the key on a separate drive. Keep this drive somewhere secure and separate from your laptop.
- Save to a file — Creates a text file you can store anywhere. Save this to a different drive or secure cloud location, not on the encrypted drive itself.
- Print the recovery key — A physical copy you can keep in a secure location.
Save your recovery key using at least two methods. The Microsoft account option is the most practical for personal use as it ensures you can always retrieve the key even if all your physical backups are lost.
Adding a BitLocker PIN for Extra Security
By default, a system with a TPM unlocks automatically at boot without requiring any additional input. This is convenient but means that someone who steals your powered-on laptop could bypass BitLocker protection if the screen is not locked.
For stronger protection, add a pre-boot PIN. Open an elevated Command Prompt (right-click Start and select Windows Terminal (Admin)) and run:
manage-bde -protectors -add C: -TPMAndPIN
You will be prompted to enter and confirm a PIN. From then on, you must enter this PIN each time you start your computer before Windows loads. This ensures that even a powered-off stolen laptop cannot be unlocked without both the TPM chip (physically embedded in your laptop) and the PIN you have set.
Encrypting Additional Drives and USB Storage
BitLocker can also protect secondary drives and external USB storage via a feature called BitLocker To Go. Return to the Manage BitLocker panel and you will see all connected drives listed. Click Turn On BitLocker next to any drive you want to protect.
For external drives, you will choose a password or smart card to unlock the drive when it is connected. This is ideal for drives containing sensitive backups, client files, or financial records.
Monitoring and Managing BitLocker
The Manage BitLocker control panel shows the status of all encrypted drives. You can:
- Suspend encryption temporarily (for planned hardware changes such as firmware updates)
- Back up your recovery key again if needed
- Turn off BitLocker if you ever need to decrypt a drive
- Add or remove protectors (PIN, startup key, etc.)
For those who prefer command-line management, the manage-bde command provides full control over all BitLocker operations. Run manage-bde -status in an elevated terminal to see a detailed status report for all drives.
Performance Impact — Is There Any?
On modern hardware with AES hardware acceleration (which has been standard for over a decade), BitLocker’s performance impact is negligible — typically less than 1% on drive read/write speeds. On older hardware without hardware acceleration, there may be a small but noticeable impact, though this is rarely problematic for everyday tasks.
The security benefit far outweighs any theoretical performance consideration for the vast majority of users.
Get Started with Windows 11 Pro Today
BitLocker is one of the strongest arguments for choosing Windows 11 Pro over Home. Combined with features like Remote Desktop, Group Policy, and Hyper-V, it makes the Professional edition the sensible choice for anyone who takes their data and security seriously.
GetRenewedTech’s Windows 11 Pro licence is available for just €21.99. Enable BitLocker the same day you install it, and your data will be protected from that moment on.
