How can I set reserved blocks for a NTFS file system

Solution 1:

extN reserves a percentage for the root user (and by extension, all system daemons which run as root). This a feature mostly specific to extN on Linux – most other filesystems actually do not have equivalent "root-only" reservations.

For most of its lifetime, NTFS also did not have any space reservation for "the OS". If the filesystem reports that it is full, then it is actually full.

A recent version of Windows 10 did introduce NTFS space reservation for Windows Update, which is only enabled for the system volume (not for all NTFS volumes).

The reserve in NTFS system volumes is fixed-size (approx. 7–8 GB) and not percentage-based. You can only control it through Windows, not through ntfs-3g yet.

• To check the reserve size:

  fsutil storagereserve query c:

• To check whether the reserve is enabled (Cmd and PowerShell):

  dism /online /Get-ReservedStorageState

  Get-WindowsReservedStorageState

• To disable the reserve (Cmd and PowerShell):

  dism /online /Set-ReservedStorageState /State:Disabled

  Set-WindowsReservedStorageState -State Disabled

Source: https://winbuzzer.com/2020/08/18/how-to-enable-or-disable-windows-10-reserved-storage-xcxwbt/