[Wylug-help] Disk cloning

[David Noble]

Help again please,
                             My 75yr. old sister has a 500Mhz PC with a 
4Gb hd which is almost full.
I have a 40Gb hd and an external USB drive caddy for it and would like 
to clone her existing O$
to the big drive.  ( OK I know it's a Windows job but  I have got her 
using Thunderbird ! and
hope to demonstrate the powers of Linux )  I use Mepis and have the 
Mepis Live disc also
Knoppix and Mandrake Move.  Presumeably the USB disc will be mounted as 
sda .
                           I've briefly Googled and seen reference to 
doing this from the command
line with dd but am not sure how exactly to use this.  Is there a 
program to do what I want?
                          I intend partioning the bigger drive with 
Gparted into 2  sections and use
the second one later for a linux installation.  Should the first 
partition for the clone be formatted
first with FAT32 or left empty ?
                                                   TIA   David