How do I save a disk image of my laptop hard drive?

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M--------++\Mark Phillips
|........||MAlan Dayley
|........||MMark Phillips
|........||MCarlos Macedo Gomes
|........||Mjordi laforge
M+-+++\..||George Toft
||.||||..||Mgm5729
||.||||..||MDazed_75
||.|||M..||Dan Lund
||.||M\..||Jim
||.|||M+\||Alan Pratt
||.|||||M||Michael Havens
||.|M|||.||Mark Phillips
||.||||M.||Patrick Fleming, EA
||.|||M..||Patrick Fleming, EA
||.|M|...||Jon M. Hanson
||.||M...||KevinO
||.||....|MWayne Davis
||.|M....|Mark Phillips
||.|M....|Kurt Granroth
|M\|.....|Mark Phillips
||M|.....|Mark Phillips
||.M.....|Mark Phillips
||.|.....|Mvodhner@cox.net
||.M.....||Dale Farnsworth
||.......M|Bryan O'Neal
||.......|MMark Phillips
||.......M\Dan Lund
||.......|MMark Phillips
||.......MDan Lund
||MSir Light
||MJeremy C. Reed
M|Mark Phillips
|MGeorge Toft
MDazed_75