Does a larger internal hard drive add weight to a laptop?

I'm looking at the Lenovo U430p and it can come with 500gb or 1tb plus some SSD. Will the 1tb hard drive be heavier than the 500gb? I'm overly concerned with portability here. I'm weak and will be carrying it all over the place.

Iwindows 8 password reset?

I have a lenovo laptop with windows 8 I don't have a USB or anything to download a password reset thing everything I find just don't work because I don't have it! I'm starting to get frustrated I've even guessed possible password but I just can't log in!

Is this laptop good for High-end games?

Lenovo G465
Specs:
AMD Athlon(tm) II P340 Dual-core processor 2.20GHz
ATI Mobility Radeon HD 4200 Series
6GB RAM
750GB HDD
Windows 7 Professional

Games to play/install:
GTA IV
Call of Duty: Ghosts
Battlefield 4: Deluxe Edition

Do i need a laptop cooling stand?

I'm going to get the Lenovo IpeadPad Z50-70 and i was wondering if i need to get a cooling stand as well.

If i do, which one? (not too expensive)

http://www.ebuyer.com/624118-lenovo-z50-70-laptop-59416331

Best Lenovo Laptop Under $600?

Lenovo has a few laptops on sale right now on their website. Which one do you think is the best? I'm looking for a 14 inch laptop and I do not want to spend over $600. Any help would be greatly appreciated.