Windows 8 and 8.1 Forums

Cluster Size for SSD

  1. #1


    Dubai
    Posts : 107
    Windows 8.1 Pro

    Cluster Size for SSD


    1) When I create my partitions using the Windows 8.1 Setup Wizard, what cluster size does it put for my SSD?

    2) How to check what cluster size I am currently on?

    3) For SSDs, is it best to stick to the default 1024 cluster size or to manually create the partition using Disk Part and set it as 4096?

    4) If your answer for 3 is to manually create them, what are the commands in Diskpart that I need to enter to have the 3 partitions ?

    I only know the basic command:

    create partition primary size=blablabla align=4096

      My System SpecsSystem Spec

  2. #2


    Gold Coast (Australia)
    Posts : 702
    Windows 8.1 x64


    can you run chkdsk?
    it should tell you current bytes in each allocation unit

    Also
    An A-Z Index of the Windows CMD command line

    Default cluster size for NTFS, FAT, and exFAT

    Cluster sizes should be relevant to win 8. I think default is 4.

    personally I use paragon partition software which enables me to make a boot drive on USB with its software. Boot to Paragon with no OS - Paragon Hard Disk Manager
      My System SpecsSystem Spec

  3. #3


    Posts : 2,191
    Windows 8.1


    The information you are looking for is available in the System Information area under "disks". Note that I did not create anything manually when I did a clean install of Win 8.1. The process took care of everything for me.

    Click image for larger version


    Here is my UEFI partition structure:

    Click image for larger version
      My System SpecsSystem Spec

  4. #4


    Dubai
    Posts : 107
    Windows 8.1 Pro


    umm call me blind but I can't see the cluster size neither in your pic not on my system
      My System SpecsSystem Spec

  5. #5


    Posts : 2,191
    Windows 8.1


    umm you are correct...

    Click image for larger version

    Still the same suggestion... leave it alone and just install Win 8.1.
      My System SpecsSystem Spec

  6. #6


    Let Windows full format the drive during installation, if it's smart enough to recognize it's a SSD, it will be smart enough to set cluster size right for it. BTW, it does proper alinement at that time too.
      My System SpecsSystem Spec

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