USB Bootcamp affect performance?

Discussion in 'MacBook Pro' started by yusukeaoki, Aug 19, 2012.

  1. yusukeaoki, Aug 19, 2012
    Last edited: Aug 19, 2012

    yusukeaoki macrumors 68030


    Mar 22, 2011
    Tokyo, Japan
    I recently made a huge mistake to install my optibay before installing Bootcamp on my second drive.
    Now I have everything set up, I dont want to go through the hassle putting it all back together.

    Now on my old 500GB HDD, I still have my OS X 10.7.4 and Bootcamp.

    If I use this bootcamp (which works fine) via USB, would this affect the performance?
    For example, if I run heavy apps, would my Mac have trouble running them?

    I never really ran OS via USB so Im not clear here.

    I always thought USB would only affect transfer speed but would this affect the performance?
    I do want to play some games on here but on VMware Fusion, too heavy.
    If I run BC through USB and play heavy games or heavy apps, would this still cause the lag?


    Wow, huge mistake here sorry.
    I tried booting BC on my external HDD and it wouldnt even show up on the list...
    Is it really impossible to boot any Windows from USB?
  2. dusk007 macrumors 68040


    Dec 5, 2009
    Only in so far as it is like running an OS on a slow HDD.
    USB adds some latency.
    As it seems you would still use USB 2.0 that would also limit die Bandwidth to about 35MB/s which is half to a third of normal 2.5" HDD.
    With USB 3.0 that difference would largely disappear.

    It is just the HDD like loading stuff and writing stuff. Ultimately performance is the same once the data is in RAM.
    In a game you get the same FPS only loading the level will take 2-3 times longer.
  3. gentlefury macrumors 68030

    Jul 21, 2011
    Los Angeles, CA
    As far as I know, mac is the only OS you can boot off a USB drive. It won't let you boot windows.

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