Entire HDD erased at the beggining of installation

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http://forums.fedoraforum.org – I just tried installing Fedora 12 and at the beggining of the install i got this message about my disk which cannot be read until it is initialized, and if i initialize it all data on the disk will be lost. Disk was formated using GUID, and had one HFS+ partition on it. I accidentaly clicked "yes" on that error message, and after realising what I just did (some 2sec later) i pulled out my computer's power cord out. Now my entire disk is erased, it has no partitions on it, and all data is lost... How do i retrieve my data from the erased disk, and why did Fedora want to do this to my disk? Plz, anybody help, it was a fairly large disk with 500GB of data :/ The moral of the story, don't do anything on your computer while under the flu :( cheers! (HowTos)