Boot Camp Assistant horribly slow at creating Windows 7 USB

Discussion in 'Windows, Linux & Others on the Mac' started by area5x1, Jul 10, 2012.

  1. area5x1 macrumors newbie

    Mar 9, 2010
    I'm creating a Windows 7 install USB device through the Boot Camp Assistant and the process is painfully slow. At first I thought it was my flash drive so for an experiment I tried just copying the ISO over to the flash drive. That seemed to go fine at a decent speed. However when it's actually creating the USB install drive it would seem to go at about 100 kB / second. I would stay in the folder and watch the size of the "install.wim" file go up very slowly, probably at a rate of less than 500 kB / second.

    I looked at Activity Monitor and it seems that my Data Read rate is hard-capped at 1 mB / sec, while my Data Write speed is capped around 200 kB / second. Could this be why? What would be the cause for those limits?

    I am using a base Retina MBP.
  2. dbyway macrumors member


    Jun 26, 2012
  3. area5x1 thread starter macrumors newbie

    Mar 9, 2010
    If I select "Download supporting software" along with "Create a USB Install Drive", yes.

    Otherwise, if I select "Create a USB Install Drive" alone, it gets stuck at what looks like 80%
  4. lannisters4life macrumors 6502

    May 14, 2012
    Just try another USB if you've got it on hand. I had a Sandisk branded one which got stuck in Boot Camp Assistant, and then I went and bought a new Lexar one, which worked fine (on 2012 MBA).

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