Have a macbook pr 17 with bootcamp. the osx 10.6 partition is giving errors (the black and white multi language message that tells you to hold down the power button..) have done a permissions repair, run techtool from a boot disc, all have failed to repair. next step is for me to reintall snow leopard, and as i have no dual layer disks or usb keys i intend to install from external usb drive using the instructions here: http://osxdaily.com/2009/09/02/inst...or-how-to-upgrade-to-106-without-a-dvd-drive/ But how do i format the drive from within windows as boot recognisable from mac? i have partition magic and cannot see ny option for osx extended or GUID Partition Table ? any ideas please?