Windows 8 and 8.1 Forums


Installation cant see my hard disk

  1. #1


    Posts : 7
    windows 8.1

    Installation cant see my hard disk


    Hi guys, I am running through a problem. I ahad updatedmy wife's laptop acer spire 5740 G from windows 7 to 8 and then updated to 8.1. She did not like os and asked me to revert back to 7. After running setup I formated the drivve C containing windows 8. But now computer doesnt boot and I tried to reinstall teh system but I cant see my hard disk- Setup runs till where do you want to install your OS and then I cant find my hard disk. Unfortunatly I ave lot of data in 2 other partitions but have nothing in drive C, Been looking for solution for last 8 hours. Thanks

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  2. #2


    Posts : 2,191
    Windows 8.1


    Try resetting your BIOS to defaults. Reboot. Make sure it is now detected by the BIOS and then try your installation again.
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  3. #3


    Posts : 7
    windows 8.1


    Quote Originally Posted by my2cents View Post
    Try resetting your BIOS to defaults. Reboot. Make sure it is now detected by the BIOS and then try your installation again.
    I set the bios values to default but still it remains the same-
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  4. #4


    Posts : 2,191
    Windows 8.1


    Unfortunately I have lot of data in 2 other partitions but have nothing in drive C
    At this point I suspect the Windows installer has encountered one of the following conditions:


    • The HDD is set as a dynamic drive instead of basic (probably not the issue)
    • If the HD is GPT partitioned you need to install to it using a UEFI interface

    (do you have the UEFI install option available instead of a Legacy BIOS install? If so, the HD might be recognized)


    See if a UEFI install will work (if you have that option available).

    Let us know.

    my2cents
      My System SpecsSystem Spec

  5. #5


    Posts : 7
    windows 8.1


    Quote Originally Posted by my2cents View Post
    Unfortunately I have lot of data in 2 other partitions but have nothing in drive C
    At this point I suspect the Windows installer has encountered one of the following conditions:


    • The HDD is set as a dynamic drive instead of basic (probably not the issue)
    • If the HD is GPT partitioned you need to install to it using a UEFI interface

    (do you have the UEFI install option available instead of a Legacy BIOS install? If so, the HD might be recognized)


    See if a UEFI install will work (if you have that option available).

    Let us know.

    my2cents
    No, there is no UEFI install option. Now I bought an external usb 2.0 enclosure to check it on my computer and it just show 12.5 GB space total and all is freee. It wont show my other partitios or my complete hard disk capacity which is 500GB. I dont know what to do cos I have important files there.
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  6. #6


    Posts : 2,191
    Windows 8.1


    Can you provide a disk management screenshot of that disk in the external enclosure?

    Click image for larger version

    Can you also type these 4 commands from an elevated command prompt and provide a screenshot of same:

    diskpart
    list disk
    select disk x (where x is the external drive number shown in the disk management view)
    list partition

    Click image for larger version

    I have to go out for a few hours so maybe someone else can pick this up in my absence. Hey Theog? Are you out and about?
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  7. #7


    Posts : 5,592
    ME, XP,Vista,Win7,Win8,Win8.1


    To install Windows 7 on a Acer Pre-installed with Windows 8, all partition will need to be deleted.

    Unfortunatly I ave lot of data in 2 other partitions
    Therefore all DATA will be deleted.
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  8. #8


    Posts : 7
    windows 8.1


    Quote Originally Posted by theog View Post
    To install Windows 7 on a Acer Pre-installed with Windows 8, all partition will need to be deleted.

    Unfortunatly I ave lot of data in 2 other partitions
    Therefore all DATA will be deleted.
    It was not preinstalled I had installed windows 8 on windows7 laptop. Then again tried to revert back wiping
    c drive.
    Ok I did what My 2 Cents asked. I am attaching images.
    Attached Thumbnails Attached Thumbnails Untitled.png   Untitled1.png   Untitled2.png  
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  9. #9


    Posts : 2,191
    Windows 8.1


    I am assuming that invalid disk 1 is the one in question; yes? If so, it is listed as a dynamic drive (which is one of the possible problems I mentioned it might be). Unfortunately, I don't have a solution for both of the following:

    How to save the data on a dynamic drive and convert it back to a basic disk at the same time (without any data loss).

    Moreover, I have never tried to do the above so I have no experience in that area. Now, if you click this link, you will see some partitioning software offerings that claim this can be done but I would wait for more feedback before attempting to do this:

    https://www.google.com/#q=how+to+cha...osing+any+data

    Who knows? Maybe some other forum member has run across this in the past and has a solution for you or can verify that one of the partitioning software offerings will work.


    Good luck,

    my2cents
      My System SpecsSystem Spec

  10. #10


    Posts : 7
    windows 8.1


    [QUOTE=my2cents;346025]


    Hi, Thanks for your help. I finally got it working. I used a software "TestDisk - CGSecurity" which was very easy to follow This converted my offline partitions to online primary partitions and then I copied all my data to my computer. Drive C did not show anything except free space which I formatted latter and volla, I attached it to my old laptop and successfully installed Windows 7. Thanks a lot one more time.
      My System SpecsSystem Spec

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Installation cant see my hard disk
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