ReFS formatted VHDX become unreadable (shown as RAW) inside VM after mounting on host

  • Thread starter Thread starter Rosch200
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Rosch200

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A virtual hard disk attached to a VM (Windows Server 2022) and formatted with ReFS becomes unreadable inside this VM, after it is mounted to the HyperV host (Windows 11) and files have been written to.To re-create the issue:Test system: Windows 11 host with Hyper-V; Windows Server 2022 virtual machine1. Create a hard disk for a VM (Windows Server 2022) in Hyper-V manager2. Initialize and format this HD with ReFS from inside the VM3. Copy some files to this virtual disk inside the VM (optional)4. Detach the VHDX from the VM in Hyper-V manager5. Mount the VHDX in the Hyper-V host (Windows 11)6.

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