hi
man what i use is a HD in GUID partition
2 partitions
one for mac os x , format hfs+
and other with w7, format in fat32, using disk util from mac os x
in the partition for w7
insert u w7 media installer and only format the fat32 to ntfs, and install w7
if w7 fuck the boot of chameleon, only install again chameleon with the option boot0hfs
good hack