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After the January 11, 2022 Windows update is installed, Removable Volumes formatted with Resilient File System (ReFS) fail to mount or mounts as RAW.

Applies to:

  • Windows 11 (original release)

  • Windows 10, version 21H2

  • Windows 10, version 21H1

  • Windows 10, version 20H2

  • Windows 10, version 1909

  • Windows 10, version 1809

  • Windows 10 Enterprise LTSC 2019

  • Windows 10 Enterprise LTSC 2016

  • Windows 10, version 1607

  • Windows 10 Enterprise 2015 LTSB

  • Windows Server 2022

  • Windows Server, version 20H2

  • Windows Server 2019

  • Windows Server 2016

  • Windows Server 2012 R2

  • Windows Server 2012


This issue may occur because the ReFS file system is not supported on removable media, including USB External drives. As part of the January 11, 2022 update, one of the fixes impacted the ability of these unsupported volumes to be mounted.

For more information about unsupported features in ReFS, see the The following features are unavailable on ReFS at this time table in the Resilient File System (ReFS) overview topic on the Microsoft Learn website.


To resolve this issue, install the January 17, 2022 out-of-band update that is applicable for your Windows operating system. If you continue to experience this issue, contact Microsoft Support.

Note This resolution only applies to ReFS version 2 and later version volumes.

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