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I have an Acer Aspire One AOD250 which comes with a dual-booting system with Android and Windows XP. When I boot into Android, it goes straight to the home screen without any verification of my identity, unlike Windows requiring a user password, or the funny grid that you get on some Android phones.

I want to ensure that if it gets stolen, that someone can't just turn it on and start reading my emails, etc. How do I do this?

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What happens if you turn on a lock pattern/PIN from Settings > Location and Security? – Soumya May 15 '11 at 22:01

You could try setting a password in the BIOS of the laptop. That way nobody could do anything at all without a password.

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I would also reccommend setting a BIOS password, they are extremely secure. – Nate Koppenhaver May 26 '11 at 19:29

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