Install options with legacy BIOS. If I dont ask, I'll never know...


  1. Posts : 1,871
    W10 pro x64 20H2 Build 19042.610
       #1

    Install options with legacy BIOS. If I dont ask, I'll never know...


    I'm just trying to further my understanding with this.

    I always clean install by using the installation media to take the drive in question down to unallocated space, and then create a new partition and install Windows. That works well and gives me the small 'System Reserved' partition and the main C partition. I add other partitions of my own choosing afterwards. All good except that each time I want to clean install I have to first back up all the stuff on the other partitions and then recreate new ones after the clean install and then copy stuff back again.

    What would happen if I used the installation media to:

    A/ Delete (or format... I'm guessing that's an option from memory) only the existing C partition and for me to clean install into that new space. I would leave the pre-existing System Reserved partition.

    B/ As above but this time deleting (or formatting...) the existing 'System Reserved' partition and clean installing. This would leave the small System Reserved partition either empty or I could delete it altogether (so now unallocated).

    Is the original 'System Reserved' partition only of use (and only usable) by the original installation that created it ?

    Would deleting the System Reserved partiton (my option B above) allow a new similar partition to be created by a new clean install or does that only happen when the whole drive is 100% empty with no pre-existing partitions (such as extra ones I add later).
      My Computer


  2. Posts : 18,430
    Windows 11 Pro
       #2

    Make sure that the data partitions that you want to keep are at the end of the drive, not the front. When you do your clean install, on the custom install screen, delete every partition that is before your data partitions. Then highlight the unallocated space and install to that.
      My Computer


  3. Posts : 1,871
    W10 pro x64 20H2 Build 19042.610
    Thread Starter
       #3

    Thanks... its an SSD but all the other partitions were created after installing Windows.

    Would installing to the unallocated space still create a new system reserved partition ?
      My Computer


  4. Posts : 18,430
    Windows 11 Pro
       #4

    Mooly said:
    Thanks... its an SSD but all the other partitions were created after installing Windows.

    Would installing to the unallocated space still create a new system reserved partition ?
    Yes
      My Computer


  5. Posts : 1,871
    W10 pro x64 20H2 Build 19042.610
    Thread Starter
       #5

    Excellent... thank you.
      My Computer


  6. Posts : 15,037
    Windows 10 IoT
       #6

    That's the way I do it. My Data drive is either the very last partition on my drive, or a separate drive. I just delete all but the data drive / partition. Then install into the unallocated space. Windows will create any and all the partitions it needs. I do it on my legacy desktop PC and UEFI laptop. I use a fat32 formatted thumb drive marked active via diskpart. Same thumb drive works for legacy and or UEFI.
      My Computer


 

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