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I am trying to install Windows 7 on my MacBook as a dual boot setup. I have a MacBook 7,1 running Mavericks. I have replaced the DVD drive with a SSD (now have 2 internal drives) so cannot use a windows CD to do the install. I have used the trick that alters the BootCamp info.plist file to allow me to create a bootable USB to do the install. So I have a bootable Windows 7 installer USB. I know this works because I can boot into it on another MacBook.

However, it turns out that my MacBook can't boot from USBs other than USBs containing a Mac OS. The BootCamp created USB (Windows 7 installer) does not appear at all on the grey boot sources screen (holding option at boot). I have tried rEFIt/rEFInd and they see that there is an OS on the USB but when it tries to boot it gives me a heap of errors saying that Mac can't boot "legacy" OSs from a USB.

To summarize: Its not a problem with corruption or incorrect formatting. I put the USB into another (newer) MacBook and can boot into it absolutely fine. This is a problem with my MacBook not being able to boot from USBs.

I need a way to boot from this USB even though the mac won't natively do it. Is there an alternative bootloader that I can install on my macbook to provide this USB booting functionality?

  • Well firstly make sure that your windows .iso file is not corrupt/incomplete/not bootable etc. (try to boot the usb in windows pc if available). Your No bootable device problem comes when the usb drive is not properly formatted or if the files are not properly copied while making it bootable. Use disk Utility to format it to FAT. And try to make it bootable now using the Bootcamp Assistant located in your utility folder. – Ruskes Sep 1 '14 at 2:57
  • Its not a problem with corruption or incorrect formatting. I put the USB into another (newer) MacBook and can boot into it absolutely fine. This is a problem with my MacBook not being able to boot from USBs – Sam Sep 1 '14 at 3:00
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    What build of OS X is on the media and have you checked that your specific version of MacBook pro boots from that version and build of OS X? It's not even clear that this is a problem with your media without some details edited in (unless you want to change this to be "How can I tell if build X runs on Mac Y?") – bmike Sep 1 '14 at 3:27
  • There is no OSX on the USB, its the Windows 7 installer... – Sam Sep 1 '14 at 9:20
  • what year is your macbook pro? – William Jan 24 '17 at 1:42

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