So you are saying the bootcamp installation will not boot your MBPr if it is on an external drive?
Is your external drive Thunderbolt? It's a whole load more difficult to get Windows to boot off a USB device.
It will let me boot the cloned installation from my external drive but not once the bootcamp partition on my internal drive is deleted. I realise this is not the preferred method and I have followed several tutorials which say exactly what order to do things in (let windows 7 install drivers, clone, shut down after clone, remove thunderbolt drive, restart osx, delete internal partition, restart osx, alt booting etc.) all to no avail. Obviously you are not supposed to boot into the cloned drive with the bootcamp partition still installed to get it to work without the internal partition but I gave up on this as I figured a 20gb partition internally with the full space on my external drive was better than nothing. Maybe it is possible with a clone it just wouldn't work with the variations I tried and given I had to delete the windows partition each time (and therefore reinstall it) I eventually gave up. My drive is the LaCie Rugged thunderbolt. Also, for what it's worth, this works without cloning if you just use bootcamp assistant and then do the windows install on an external drive but you have to keep the 20gb internal partition. I am hopeful this windows prepared method will work however. I am yet to test since my MBPr is getting its screen replaced atm but I will post an update once I get a chance to try it out.
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