Full Disk Encryption (FDE) is a security feature on Android devices that encrypts all data stored on the device, including the operating system, applications, and user data. When FDE is enabled, the device's data is automatically encrypted when it is written to storage, and it is decrypted when it is read by the device. This means that if the device is lost or stolen, the data on it will be inaccessible to anyone who does not have the correct decryption key.

To enable Full Disk Encryption on an Android device, you will typically need to go to the Security settings menu and select the option to enable encryption. You will be prompted to set a passcode or password that will be used to decrypt the data on the device. Once FDE is enabled, it cannot be disabled without first decrypting the data on the device, which can be a time-consuming process.

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