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"ERROR:Unknown Filesystem" When trying to boot OSX install USB

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I have encountered a problem when trying to boot from my OSX86 10.5.7 iDeneb USB installer that I have dumped with DD for Windows. When I try to boot from my USB drive, my computer gives me an error that says "ERROR: Unknown Filesystem. Grub Rescue>". I have installed Ubuntu 11.04 before but I have deleted it and I am running Windows 7 64 Bit.


I have followed the directions on this tutorial:





System Specs


Dell Vostro 3550


Windows 7 Home Premium x64


8.00 GB RAM


Intel Core i3-2310M @ 2.10 GHz



Any Help would be greatly appreciated.





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