Shrink Wrap utility

I wanted to clone my HD using Shrink Wrap.
The OS is on a 2.3 G drive
Destination drive is six G.
Error message : Destination disk wrong size.
I re-partitioned the Destination dusk to *exactly* the same size as
source but still get same error message.
What am I doing wrong?
Just a matter of curiosity...I can put both drives in my Linux machine
and use "dd" .
Don't think that's ever failed.