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FDE and FBE is a form of data encryption on Android.
Poco F1 uses FDE by default.
FBE stands for File-Based Encryption while FDE stands for Full-Device Encryption.
Using FBE gives better performance and security. FDE on an unlocked Poco F1 is basically meaningless as it's encrypted with a default password.
With FBE, your data remains safe in case of losing your device.