Formatting disc for Win 10 installation. What about Unallocated Space?

  1. Posts : 75
    Windows 10 Pro (1909)

    Formatting disc for Win 10 installation. What about Unallocated Space?

    Version 1909 (OS Build 18363.1440)

    I have removed an SSD disk from a laptop, in order to format it and place it to another laptop. Windows installation will follow.
    Disc had a Primary Partition and a System Reserved Partition (100 Mb).
    I connected it to my pc, as external drive, and formatted it. Apparently, only Primary Partition was formatted.
    The System Reserved Partition was still there. I deleted it (right click>Delete Volume) but it seems that I only made it Unallocated Space.
    So, what I see now, through Disk Management, is a Primary Partition and an Unallocated space (photo 1).
    I tried to Merge the Unallocated space to the Primary Partition (right click>Extend Volume etc) but the message just before the procedure completes (photo 2), made me hesitate.

    I remind you that the disc is going to be used as OS one.

    What should I do?
    Is there a way to bring the disc back to a brand-new condition?


    My pc runs Win 10 Pro Version 1909 (OS Build 18363.1440)
      My Computer

  2. Posts : 7,392
    windows 10

    Delete the partition you made leave it blank like a new hd windows will create everything
      My Computer

  3. Posts : 40,351
    windows 10 professional version 1607 build 14393.969 64 bit

    It is not necessary to format the disk drive removed from the laptop as it will become an unallocated disk drive during the new Windows installation.

    When a clean install is performed there is a menu to highlight and delete partitions.
    All partitions are deleted making an unallocated disk drive.
    The Windows Media Creation Tool (MCT) (Windows iso) will install Windows on the unallocated disk drive.

    Clean Install Windows 10

    If you had had problems with the disk drive or if you want to make sure that a new user cannot recover any files with partition recovery software then you could use the clean all command. This writes 0 and 1 to each sector of the drive. This is extra ware and can be used when selling a computer.

    Erase Disk using Diskpart Clean Command in Windows 10
      My Computer

  4. Posts : 75
    Windows 10 Pro (1909)
    Thread Starter

    Thanks for the answers!
      My Computer

  5. Posts : 4,814
    Windows 7 HP 64 - Windows 10 Pro - Lubuntu

    Windows can be installed in two ways: Legacy-MBR or UEFI-GPT
    To install as Legacy-MBR you must boot the installation drive as Legacy
    To install as UEFI-GPT you must boot the installation drive as UEFI.

    If you have a UEFI BIOS, you should install as UEFI-GPT
    Detach any other drives (SATA or Power cable) from the MB.

    During POST, press F12(?) to launch the boot menu. You will see two options for the USB drive. USB UEFI (Name) and USB (Name). Select USB UEFI (Name)if you want to install as UEFI-GPT or select USB (name)if you want to install as Legacy-MBR.
    Go to install and delete ALL partitions on the main drive till you have one and only one unallocated space and then proceed.
    If you don't want to use MS account, don't enable updates or connect to the internet during installation.
      My Computers


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