When I go through the bootcamp process, then get to the windows 7 setup screen. I format the bootcamp partition like the instructions say, then click next with that highlighted and get the error:

Setup was unable to create a new system partition or locate an existing system partition.  See the Setup log files for more information.

I'm on a 15" Macbook Retina. I do NOT have any: External Drives, other USB Drives plugged in.

The only thing I have plugged in is the USB with the Windows 7 Setup files.

I had this same issue when trying to install windows 7 via usb on my Desktop (moving to a SSD) but I was able to go around that issue by just installing from the current installation on the HD. Obviously I can't do that here.

Do I need a specific kind of USB stick? or what should I look for?

Update Checking the logs from the command prompt I see a bunch of errors: Couldn't find boot disk on the bios based computer

I believe since my USB stick is capped at 480mb/s (based on the sys info) I'm using a USB2 stick and I've swapped sides.


Lots of potential gotchas are mentioned here: https://discussions.apple.com/thread/3259726?start=0&tstart=0

Including the type of stick (USB 2.0 vs. USB 3.0), the port its plugged into, etc.

  • The problem was just the USB stick. It was USB2.0, I bought a new 8gb 3.0 and also when I went to make the USB stick I had it download the latest updates as well. – Doug Oct 30 '12 at 15:41
  • Using a different USB slot worked for me. – Richard Jan 17 '13 at 14:50

Try this:

Go back to OSX and delete the W7 partiton with Disk Utilities and Re-run the Bootcamp assistant. When you get to that same spot you should have 4 partitions, a small one, a large one, a small one, and empty (unformatted) partition for w7. Format that large partition (its one of the options for the partition) and choose that partition for installation.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .