Windows 8 and 8.1 Forums


setup was unable to use the existing partition because it does not ...

  1. #1


    Posts : 21
    windows 7 64 bit

    setup was unable to use the existing partition because it does not ...


    I got error when trying to install windows 8 consumer preview "setup was unable to use the existing partition because it does not contain the required free space. "I am trying to install on a separate partition, size is 100 GB. the drive is 1 drive separated into 2 partition. installation could not continue. then I tried delete the partition, make it into unallocated space, still not working. then I tried to merge the 2 partitions into 1 drive, now size is 200 GB, still the same message. how to solve this?

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  2. #2


    Welcome to WindowsEightForums, Show us your Disk Management screenshot...
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  3. #3


    Is the disk Dynamic?
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  4. #4


    Posts : 21
    windows 7 64 bit


    how to check if it is dynamic? drive F: is used for install windows 8
    Attached Thumbnails Attached Thumbnails disk management.png  
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  5. #5


    Germany/Florida
    Posts : 4,514
    Vista and Win7


    Disconnect disks 0,1 and 2 and try again. With that setup you get no double boot, but you change systems by changing the BIOS boot order.

    I think you get this message because there is not enough space in your 100MB 'Z' partition. The Win8 BCD is pretty big and probably does not fit.

    You could, of course, try to make Z bigger (e.g. 300MB). But that will require quite some gymnastics that you should only attempt if you feel comfortable with managing disks.

    Another (easy) solution would be to move your bootmgr to C of Win7. Then there would be plenty of space. Bootmgr - Move to C:\ with EasyBCD - Windows 7 Forums
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  6. #6


    Portsmouth Hants
    Posts : 772
    Windows 8.1 Pro with Media Center


    Windows 8 wants a bigger system reserved volume than Windows 7 did. It doesn't need it.

    Imagex or SmartWIM would be able to apply the Windows 8 disk image in install.wim on the downloaded .iso to a formatted drive on your system. You can do it with a drive as small as 15GB.

    I describe how I managed it here:

    How did you setup your Win 8 install?
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  7. #7


    Posts : 21
    windows 7 64 bit


    but I want to have dual boot. what is best solution?
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  8. #8


    Germany/Florida
    Posts : 4,514
    Vista and Win7


    Use the last option I posted. I is dead simple.

    Another (easy) solution would be to move your bootmgr to C of Win7. Then there would be plenty of space. Bootmgr - Move to C:\ with EasyBCD - Windows 7 Forums
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  9. #9


    Posts : 21
    windows 7 64 bit


    what is the purpose of moving bootmgr to c:\ ? will that make windows 7 unable to boot? will that solve the problem?
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  10. #10


    Germany/Florida
    Posts : 4,514
    Vista and Win7


    It does not matter where the bootmgr is. As long as there is a bootmgr, the system will boot.

    The reason I suggested to move it to C; is that then there would be ample space for the Win8 BCD to fit. The 100MB partition is just too small.

    I always move the bootmgr to C because I want to get rid of the 100MB partition which makes no sense in my configurations. You will not find a 100MB partition on any of my five Windows7 systems. Example:

    Click image for larger version
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