Windows 8 and 8.1 Forums


Whats the correct amount of partitions for Windows 8.1?

  1. #11


    When creating the 350MB System Reserved partition, do i create it as Logical or Primary?
    File System NTFS?

    What do I do with the 18GB remaining that was unallocated? Merge it with the main C: partition?

      My System SpecsSystem Spec

  2. #12


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


    Thanks - I see the files now!
    Yes Macrium is free version... do you think the paid version is worth getting?
    There are additional features with pro version, you can selectively back up folders, set up to boot without using USB, copy partitions and moving them around etc... while the free only allow you to backup/clone the whole disk.

    What do I do with the 18GB remaining that was unallocated? Merge it with the main C: partition?
    Yes merge it first. then shink by the amount shown in my post in the other thread. That will give you exactly 350MB unallocated, initiallize it as simple and assign to letter Z:, quick format

    When creating the 350MB System Reserved partition, do i create it as Logical or Primary?
    File System NTFS?
    When you create a partition and assign a letter to it, it is logical and yes set it to primary. Later on, we just remove the drive letter to make it hidden.
      My System SpecsSystem Spec

  3. #13


    Thanks TopGun! Just in case I do have to reinstall Windows in the future, I'll convert to GPT at that time. So I'll take notes now on how to do that. In order for Windows to create the identical structure as my laptop, I'm guessing I need to disable CSM mode in the ASUS UEFI bios? Are you able to provide further guidance or is this now outside your area of expertise?
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  4. #14


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


    Quote Originally Posted by orlando1974 View Post
    Thanks TopGun! Just in case I do have to reinstall Windows in the future, I'll convert to GPT at that time. So I'll take notes now on how to do that. In order for Windows to create the identical structure as my laptop, I'm guessing I need to disable CSM mode in the ASUS UEFI bios? Are you able to provide further guidance or is this now outside your area of expertise?
    It really depends on how you boot up your Windows Installation, on DVD/USB Windows installation, from the boot screen if you select UEFI, then Windows will try to install with EFI provided if you set the BIOS correctly then Windows will initialize the SSD (in your case) to GPT. If you did not set correctly, Windows Installation might complaint that it cannot install etc... See screenshot

    Each MB manufactuter use different BIOS (Phoenix, Megatrends ....). Mine is from Megatrends and it has an option to use: EFI or EFI+BIOS so if I set to EFI+BIOS in the BIOS, The Windows installation will be determined by how I boot the Installation Disk with.

    Click image for larger version

    I need to disable CSM mode
    Yes then it will be stricly in UEFI Mode.

    Hope this helps.
    Last edited by topgundcp; 18 Jun 2014 at 00:53.
      My System SpecsSystem Spec

  5. #15


    Posts : 1,121
    Windows 8.1 x64


    The CSM disable mode if basically for the Windows 8 Secure Boot environment. You can install in UEFI with it enabled, you just have to boot to the UEFI version of the install media.

    A GPT configured drive does allow more primary partitions, as topgundcp mentions, but it also allows the Windows 8 secure boot, if you ever want that. Possibly also the Fast Startup, but not sure.

    A system reserved partition on a legacy install is normally the system partition and must be active if used to hold the boot files, so no logical partitions allowed. MBR configured hard drives can handle 4 primary partitions or 3 primary and one extended partition, which contains the logical partitions.

    There are 3 basic types of installs. One is the Windows 8 Secure Boot, which requires a UEFI install. The next is a UEFI install that does not support Secure Boot (CSM enabled) and the last is the Other OS or Legacy installs.

    Windows 8, and some Linux versions can be installed with Secure Boot. Windows 7 can be installed as UEFI, but does not support Secure Boot. Windows 8, Windows 7 and other OSes can also be installed as Legacy.
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  6. #16


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


    @Salgrass: Well said.

    And since we mention about the secure boot, let explain a little more:
    Secure Boot is a feature on UEFI-based PCs that helps increase the security of a PC by preventing unauthorized software from running on a PC during the boot sequence. It checks that each piece of software has a valid signature, including the operating system that will be loaded.
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  7. #17


    So once Windows 8.1 is reinstalled, are the following settings what I should have in my American Megatrends BIOS:

    Secure Boot -->enabled
    Fast Boot -->enabled
    Launch CSM Mode -->disabled

    Is this optimal?


    (BIOS seems to have become alot simpler than 10-20 years ago.)
      My System SpecsSystem Spec

  8. #18


    Oh another question.... the 1st drive on my laptop (for the OS and programs) is GPT.... if I add a 2nd HDD, should I initialize is as GPT too, or just MBR?
      My System SpecsSystem Spec

  9. #19


    Posts : 5,360
    7/8/ubuntu/Linux Deepin


    EFI is much more complicated and limiting.

    GPT is fine. Just a partitioning style. You can use gpt style with bios or efi firmware.

    The confusion arises because of windows peculiarity. Windows will only boot from a gpt partitioned disk if you are also using efi ..
      My System SpecsSystem Spec

  10. #20


    So once Windows 8.1 is reinstalled, are the following settings what I should have in my American Megatrends BIOS:

    Secure Boot -->enabled
    Fast Boot -->enabled
    Launch CSM Mode -->disabled

    Is this optimal?
      My System SpecsSystem Spec

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