Answer Best answer as chosen by user tapasdesai
Some supplemental info
Some supplemental info to the answers already given.
You don't NEED to upgrade your RAM at the same time as the HDD. It's probably a good idea, but it is not necessary.
Having run into this recently at work... Check the official specifications page for your system. Find out what the max sized HDD was that could have been in the system from the factory. That is what Apple will consider the maximum tested and supported size drive for your system. Larger capacity drives may, or may not, work. I've had an ongoing issue with a customer at work regarding this basic issue, so I'm just going to try and help manage your expectations a little. Just because you see forum posts about the Internet from people who have gotten this or that to work does NOT mean you will meet with similar good fortune. If you go beyond what the largest CTO option was for your particular model, then there's no real telling what will happen. It may work perfectly, it may work poorly, it may not work at all. Just be prepared for those latter two options, and don't get it in your head that it's always going to work perfectly.
Apple doesn't make RAM, they just buy it from other companies. Any RAM, meeting the same spec as the RAM that came in your computer, will work. Just make sure it's SO-DIMMs for laptops, and not regular DIMMs for desktops. Regular DIMMs are about 2.5X too long.
There was also a recent discussion on one of these Mac forums here at Cnet covering the issue of using a drive with both Windows and Mac OS X. Might be worth perusing.
I also suspect you actually have the aluminum MacBook which later became the Mid-09 13" MBP. Easy mistake to make, I still sometimes do it, and I am a professional Apple repair tech. Either way, when you go to replace the drive, BE CAREFUL! The cable that connects the drive to the logic board is a bit fragile, and can be torn fairly easily if you are not careful. You will have to go to an Apple store or AASP to get your hands on a replacement of one of those, and they may insist on charging labor to put it in for you.
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