why do you want to restore the image to a hd? do you have 2 disks, one with leopard and another one where you want to install snow? if so, you don't need to restore the image, you can just mount the dmg image and follow exactly the steps from the first post of this thread, and it should work.

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CPU: AMD Athlon 64 X2 5000+
RAM: 2 x 1 Gb
2xSATA HDD
ATA DVDRW
MB Asus M2N Nvidia MCP61
Video: GeForce 8600 GT 256 Mb RAM
ADI 1988 onboard audio
Audigy soundcard
Realtek lan