Sony VPCZ2390X - Manual (Page 101)

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Using Your VAIO Computer >
Using the TPM
10 Follow the instructions in Windows Help and Support to enable BitLocker Drive Encryption.
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.