I'm trying to get my Mac to boot from a USB flash drive. I know the drive works and is bootable, because it works with my friend's Windows PC. Specifically, I was running Windows 7 on my Mac to create the bootable disk, which has Windows Defender Offline on it. Outlook for mac signature auto change. I have had the same issue trying to use the Ultimate Boot CD on a USB, various Live USBs for Linux, etc. So, what do I have to do to get my Mac to recognize and boot from another OS on a USB flash drive? Getting your Mac to load from a USB drive is fairly straightforward. Insert the USB boot media into an open USB slot. Press the Power button to turn on your Mac (or Restart your Mac if it’s already on). USB speakers also work with the Mac. Connect your speaker’s USB-audio cable to one of your Mac’s USB ports, and OS X should automatically route audio to the speaker system. Or maybe a better question, if there isn't a simple answer, would be what does Bootcamp do to allow booting from a Windows install DVD or to allow Windows, once installed, to boot? EDIT: I was able to sort of get results using the bless command in Terminal. Specifically, I used sudo bless -mount '/Volumes/WDO_Media32/' -legacy -setBoot -nextonly and then did a restart. Latest version chrome for pc. Though from Chrome 55 onward the smartphone version was, there was still a lot of room for maneuver, especially on the desktop. Boot was slower, but then I was presented with the normal log-in screen. The log in screen, though, was much slower than usual, as if something else was happening in the background. So, I seem to be effecting something with that command, but I still can't boot from my Windows bootable USB drive. Boot Camp has to emulate a BIOS system, as Windows requires this to run. Apple uses something called the bless tool in order to instruct EFI (which Macs are based on) to activate this BIOS system. However, if I recall correctly, emulation of BIOS is not supported on Mac for any device that is not attached via a SATA connection (ie. Internal drive, DVD drive). So, I believe that you cannot boot from your USB key. If you want, you could install an alternative bootloader on your Mac that would allow you to do this. I don't think Windows 7 requires a BIOS to run. I'm pretty sure it works with an EFI system as well. In any case, the boot drive I'm trying to make includes an EFI folder in the root directory. Seems like it should work with EFI. I used to use rEFIt when I had a triple-boot setup with Mac OS, Ubuntu, and Windows XP. Installing Lion seems to have disabled it, and I was afraid to enable it again in case it's not compatible. I'll do some research and see it if still works with Lion, despite not being updated recently. – Jul 29 '12 at 21:25 •. You can in fact boot Windows from a USB drive on a Mac. I've done this recently with the Windows 10 Technical Preview, but the software I used should work with Windows 7+, but it does have a disclaimer that says Windows 7 does not support USB 3.0, so if you're trying this on a newer Mac, you'd have to use Windows 8 or higher. I'm booting Windows 10 off of an external USB to SATA hard drive dock. It takes a while for Windows to boot, but it runs okay once it's started. I imagine it'd be much faster if I was running USB 3.0. I needed another Windows computer to run the utility called 'WinToUSB' here is a link to their site: You will need a Windows installer disk or ISO image to create the bootable image. Do NOT attempt to create or format any of your Mac partitions from within Windows because there is a very high chance you will lose some/all of your Mac data. I've verified this.
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