Windows 8 and 8.1 Forums


Unallocated partition after format and delete

  1. #1


    Posts : 9
    windows 8.1

    Unallocated partition after format and delete


    i've just formatted my HDD partition where os was. After that I've also deleted the respective partition and now I can not do anything to install the os in that partition, the partition now is unallocated space. I was using Windows 8.1 before all this mess.
    Pls help.

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  2. #2


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    I assume that you have either Windows 8.1 USB/DVD. If so then you should not have any problem reinstall Windows 8.1. Just boot up the PC from the Windows 8.1 USB/DVD. In one of the screen, select Custom Install, select the unallocated partition, click New then Next. Windows Installation should re-create all the neccessary partitions and install Windows.
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  3. #3


    Posts : 9
    windows 8.1


    No can' t do. For unallocated space there no option to install windows. The NEXT tab it is not activated, is under gray color
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  4. #4


    Posts : 879
    Windows 10


    Quote from this post: UEFI Boot Mode (installing using the GPT partition style) and Legacy BIOS Boot Mode (installing using the MBR partition style). -> link

    Normally, you should be able to delete all the partitions on the Where do you want to install Windows? screen.

    Note: But if you cannot delete all the partitions on the Where do you want to install Windows? screen.

    - Boot the computer using the Windows 7/8/10 installation media.
    - On the first screen, press SHIFT+F10 to bring up the command prompt.
    - Run the following commands at the command prompt.

    diskpart
    list disk (this will give you a listing of the disks on your system)
    select disk # (select the disk you want to clean, for example select disk 0)
    clean (running the clean command will delete all partitions on the disk)
    exit

    Even if you are going to use the GPT (GUID Partition Table), you do not need to run the convert gpt command, since you are not creating the partitions at a command prompt.

    - Close the command prompt window and continue your Windows installation as usual.

    Click image for larger version
    Last edited by genet; 07 Nov 2015 at 11:34.
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  5. #5


    Posts : 9
    windows 8.1


    Thx I will try & reply
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  6. #6


    Posts : 9
    windows 8.1


    Previously my HDD had two partitions, when I do disk part & list part I can see only one partition which cumulates both partition. Like this I will loose everything from D partition. Any idea what I can do not to loose that data?
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  7. #7


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    Quote Originally Posted by goguta View Post
    No can' t do. For unallocated space there no option to install windows. The NEXT tab it is not activated, is under gray color
    I have done this hundreds of times so I know it works.
    You need to find out whether the HD was initialized with GPT or MBR disk style.
    Use diskpart and type: list disk
    If the last column under GPT has an asterisk then your disk was initialzed with GPT style. otherwise it's MBR.
    For GPT style, You must set the BIOS to UEFI and You must boot your Windows installation with UEFI running 64 Bit.
    For MBR style, You must set the BIOS to MBR and you can install Windows with either 32 or 64 bit.
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  8. #8


    Posts : 9
    windows 8.1


    The problem is that I can not see the two partitions under disk part / list disk. It shows the full HDD. And since in my D partition I have some important data which I really do not want to loose there is a problem.
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  9. #9


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    Quote Originally Posted by goguta View Post
    The problem is that I can not see the two partitions under disk part / list disk. It shows the full HDD. And since in my D partition I have some important data which I really do not want to loose there is a problem.
    1. Diskpart
    2. list disk
    3. select disk # ========> where # is disk number
    4. list partition
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  10. #10


    Posts : 9
    windows 8.1


    Ok maybe I was misunderstood. There is only one partition under disk part/ list disk. But my laptop has two partitions, C & D. C had the OS and is faulty now, D has some important data which I do not want to loose.
    but under disk management I had two partitions, actually three. One was small of aprox 350 Mb, FAT32.
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Unallocated partition after format and delete
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