Does anyone know the best way to copy a partition?

I have a 13GB hard disk..If I use 'dd' to copy hda1 to hda2
(both 2GB primary partitions), it takes about 20 minutes (approx. what 
I expected).  If I copy hda1 to hda6 (2GB extended partition) it
takes about 2 hours!

Why is this so slow ? 
Are 'dd' copies made faster by using some of the dd parameters (like bs=32768
IIRC) ?
What's the best way to copy from partition to partition ?

Thanks for any insight
Ralph

P.S. This is my backup for Windows NT drive, which crashes on a 
regular basis..imagine that :-o

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