I have a 40TiB external storage array connected via USB and I need to format it for use with Windows 10. The problem i see is that NTFS only supports these large volumes with sectors larger than 4096B which is a limit i dont want to exceed, because NTFS compression does not work beyond it.

Are there filesystems with transparent compression available for Windows 10, that support 40TiB volumes?

  • 2
    But everything else also does not have NTFS compression…?
    – Daniel B
    Oct 25, 2021 at 11:21
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    I was about to comment the same thing. It sounds like you have already done some research on different file formats. It is highly unlikely that you will get any better answers here. You will have to choose one that is supported by Windows 10, and can handle large partitions. There are likely to be pros and cons, but you haven't given enough information about what the purpose of this drive is/how often you will access these files/whether it needs to be readable on other devices
    – Randomhero
    Oct 25, 2021 at 11:25
  • Ok do you have any recommendation? its not really about the best fit at this point, it just seems to me like you can not get transparent compression at all with this large a volume which seems very strange to me. I checked FAT32, exFat, NTFS, HFS, HFS+ and ReFS
    – user134450
    Oct 25, 2021 at 12:16
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    Why not just create three individual volumes then and keep the 4 KB clusters? Why not instead look at deduplication rather than transparent compression? It's not really that surprising as storage is cheap and especially transparent compression on large files is going to be very expensive.
    – Seth
    Oct 25, 2021 at 12:27
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    @user134450 you can't use HFS and HFS+ on Windows, and both are far worse than NTFS. If installing a driver is OK then you can use Btrfs or ZFS
    – phuclv
    Oct 26, 2021 at 13:48


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