I plan on upgrading the hard drive on my aluminum MB. I will be purchasing the new HD with an USB external enclosure. The process I will use to transfer all my data will be do connect the new HD via the enclosure and then use a program to clone my existing HD to my new one. (Can I do this within MAC OS or will I need a 3rd party app?) Is this a good reliable process to use to keep all my data? Will I run into any problems once I install the newly cloned HD and power up?