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DELL Vostro 3500 laptop

Last Modified: 2013-11-17

Can someone tell me if I buy a DELL Vostro 3500 laptop with a 9-cell battery, how many hour can be last longer for under a normal usage.

And, it has an option for "encrypted harddrive", how it work?  Does user need sign on with a passphrase?  I was using PGP whole disk encryption, I was asked to enter passphrase whenever I turned on computer, is it working the same way?
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