clone - How do I create an image of a hard drive?

I have an old laptop with a 20 GB hard drive, a spare 60 GB hard drive, and I'd like to convert the laptop to use the new larger drive by copying an image of the 20 GB drive onto the new drive and expanding the partitions.

Once I get the image of the old drive onto the new drive I can manage the re-sizing of the partitions, but I'm not sure how to create the image of the hard drive, or how to copy that onto the new drive.

One slight trouble is that I don't have my desktop machine here (I also don't have a laptop-drive to IDE converter) and so I'm going to need to do all of this using a live CD and an external USB hard drive.

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