Can't boot to Windows 7 USB install disk MADE with BootCamp

Discussion in 'Windows, Linux & Others on the Mac' started by 128keaton, Dec 23, 2014.

  1. 128keaton macrumors 68020

    128keaton

    Joined:
    Jan 13, 2013
    #1
    Hey guys, frustrating issue thats got me hopping. I've been trying to install Windows 7 on an Early 2008 iMac. I enabled the USB install option in Bootcamp and selected my Win7 ISO (known good!). I rebooted but it never showed up. I've tried another USB port, another USB drive, another ISO. It doesn't show up in the boot menu (native, rEFIt, rEFIed) nor the startup pane. What the hell is happening?
     
  2. alksion macrumors 68000

    alksion

    Joined:
    Sep 10, 2010
    Location:
    Los Angeles County
    #2
    I've never had good luck with Bootcamp making me a bootable disk. I always make my flash drives bootable first and then install Bootcamp.

    I use a software called Rufus on my windows machine. Works great.
     
  3. 128keaton thread starter macrumors 68020

    128keaton

    Joined:
    Jan 13, 2013
    #3
    I'll try that, I use that occasionally for other stuff, but now I'll try this method. I shall report back soon.
     
  4. alksion macrumors 68000

    alksion

    Joined:
    Sep 10, 2010
    Location:
    Los Angeles County
    #4
    Great let me know.
     
  5. 128keaton thread starter macrumors 68020

    128keaton

    Joined:
    Jan 13, 2013
    #5
    Hmm, its a GPT partitioned drive, it wouldn't show up in the option menu, but it would in the rEFId menu, but it errored on boot (no bootable drive found). Booting OS X to see if it show up in the 'Startup Disk' prefpane.
     
  6. Gjwilly macrumors 68030

    Joined:
    May 1, 2011
    Location:
    SF Bay Area
    #6
    That's your problem right there.
    Windows boot drives must be MBR.
    Go back to Disk Utility and repartition it (not just reformat it) and then run Bootcamp again.
     
  7. alksion macrumors 68000

    alksion

    Joined:
    Sep 10, 2010
    Location:
    Los Angeles County
    #7
    Good catch!
     
  8. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #8
    Another thing to note is that not all Intell Macs can boot from a USB Windows 7 Boot Camp drive easily or at all. Your iMac may be one of those models.
     
  9. rigormortis macrumors 68000

    rigormortis

    Joined:
    Jun 11, 2009
    #9
    I'm pretty sure that usb keys don't really have boot sectors. they are bootable because the firmware of the usb key emulates the boot sector.

    for example. if you took a dos 3.3 disk and copied
    COMMAND.COM
    IO.SYS
    MSDOS.SYS

    to it, with the hidden system attribute, the usb key would actually boot. because the usb key's firmware sees those files, and passes them to the computer.


    i think u just format as FAT
    and write the iso to usb using rufus or another utility it would boot without any other issues


    http://pcsupport.about.com/od/file-folder/fl/burn-iso-usb.htm

    here is a tech net link
    http://blogs.technet.com/b/danstolt...elease-preview-or-other-operating-system.aspx

    when i say usb keys don't have a boot sector, i think what i mean is that usb keys don't have a track 0, and track 0 is actually in the usb key's firmware that emulates track 0

    if you copied the contents from the windows cd to the usb and included all system and hidden files, it probably would actually boot.
     
  10. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #10
    For Windows and other MBR native operating systems, there is a boot sector for USB drives. While it isn't a fully standard MBR sector, it does exist and if it is damaged or absent, the machine will not boot from it if it is running BIOS or a BIOS emulated firmware as the case with Intell Macs' EFI.
     
  11. 128keaton thread starter macrumors 68020

    128keaton

    Joined:
    Jan 13, 2013
    #11
    Very possible, I might just have to wait for some new DVDs since mine don't want to be read or written to :p.
     
  12. Palgan macrumors newbie

    Joined:
    Jan 11, 2015
    #12

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