OT:How to image a harddrive? — UK Media DVD Forum — DVD MP3 AVI MP4 players codecs conversion help

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I want to replace my harddisk.
Can anyone recommend how to take a full image copy?. I looked at Nroton
Ghost but you appear to have to install it on the pc and its bloatwear. I
am ideally looking for something bootable that i dont need to install. Any
ideas?