4 Replies Latest reply: Mar 20, 2013 7:03 PM by Rawkamusiq
Nortegafroysa Level 1 Level 1 (0 points)

Hello world!

I have a bootable usb drive, but I need to change the BIOS options to boot into my usb. First, how do I access the BIOS on my mac? Second, how do I change the settings so I can boot into my usb?


Thank you!

  • den.thed Level 7 Level 7 (25,180 points)

    If the USB drive is bootable and has something on it to boot from, them all you need to do is select it in the Startup Disk Preference


    Screen shot 2012-02-19 at 12.58.46 PM.jpg


    or restart holding the Option key and select it from the Startup Manager.


    Screen shot 2012-02-19 at 1.00.21 PM.jpg


    See > Startup Manager: How to select a startup volume



    If not, then see > Starting from an external USB storage device (Intel-based Macs)

  • Rawkamusiq Level 1 Level 1 (0 points)

    what if you had starting using bootcamp to install windows and when it booted up it wont read the usb but i cant get it back out of the windows boot up and it keeps asking me for disk when i boot it up is there a way to change the settings to boot the usb from the windows install window?

  • den.thed Level 7 Level 7 (25,180 points)

    What startup volumes do you see when you startup holding the Option Key...? Do you see your Macintosh HD or OS X Install Disc...? If so, then select one of those and startup from that instead of Windows.


    What is on the USB, Windows or OS X and it it a bootable volume...? If it is not, then it will not show up in the Startup Disk Preferences or Startup Manager. 


    I do not use Bootcamp or run Windows on my Mac's so don't quote me on this, but I don't think that Windows can boot from an External USB or FireWire Hard Drive like OS X.

  • Rawkamusiq Level 1 Level 1 (0 points)

    im using osx lion and the options were mac hd and recovery hd when i did options so it aloud me to get back into my mac boot when i selected mac hd but the bootable usb is a fat with windows 7 on it but from what i was reading is that it shouldnt work with a usb because there is no way to change the bios bootup on the windows side so i might have to just burn a copy instead on a dvd.