If all you're doing is replacing the hard drive that's already there, then you're just performing a basic hard drive swap. Make sure you've got the right size (a standard 2.5" 9.5mm laptop drive), and you're good to go after [guide|751|installing the OS]. I personally prefer to just use a Time Machine backup to restore to the new drive.
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If all you're doing is replacing the hard drive that's already there, then you're just performing a basic hard drive swap. Make sure you've got the right size (a standard 2.5" 9.5mm laptop drive), and you're good to go after installing the OS. I personally prefer to just use a Time Machine backup to restore to the new drive.
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''' Update '''
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I have become aware that the OS install is quite a bit different for Lion than for Leopard and Snow Leopard, thanks to the other people providing answers. I would trust someone more fluent in Lion than myself for OS install tips, but my answer about the physical hard drive is still correct.
If all you're doing is replacing the hard drive that's already there, then you're just performing a basic hard drive swap. Make sure you've got the right size (a standard 2.5" 9.5mm laptop drive), and you're good to go after [guide|751|installing the OS]. I personally prefer to just use a Time Machine backup to restore to the new drive.