Sony VGNZ890H - Manual (Page 83)

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Using Your VAIO Computer >
Using the TPM
11 Save the recovery password to the USB flash memory device in the window for saving the recovery password.
12 Follow the on-screen instructions.
The encryption process will start.
!
Updating your BIOS with updating software, such as the VAIO Update, changes the BIOS settings back to the default. You need to repeat the steps
above again.
It takes several hours to complete the encryption process.