Recovering an erased hard drive
by Christopher Breen, Macworld.com

Reader William Eschenfeldt shouldn't-a, hadn't-a, oughn't-a done something with
Disk Utility that he now regrets. He writes:

I recently bought a new iMac. While copying files from multiple external hard
drives to the new machine I accidentally erased one of the drives before it was
copied (using Disk Utility).

http://www.macworld.com/article/143139/2009/10/recover_erased_hard_drive.html?ls\
rc=nl_mwweek_h_cbintro