Acer TravelMate P273-M - Manual (Page 24)

Acer ProShield 6
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Note: Select a password that you will remember, but is difficult to
guess. Do not use words that can be found in a dictionary. It is
advisable to use a combination of letters and numbers.
Once you have set a password, you can click Next to proceed to setting
up a Personal Secure Drive or click Finish to exit the wizard.
Personal Secure Drive
The Personal Secure Disk (PSD) is a secure section of your hard disk
where you can save files. You can only get access to the PSD via
password or fingerprint authentication.