There is also an issue with Storage Spaces in Windows 10 version 2004

Windows 10 version 2004 is out with a list of known issues that is growing over time. Today, Microsoft confirmed one more bug in the newest OS, that affects the Storage Spaces feature.

Windows 10 Storage Spaces

Storage Spaces helps protect your data from drive failures and extend storage over time as you add drives to your PC. You can use Storage Spaces to group two or more drives together in a storage pool and then use capacity from that pool to create virtual drives called storage spaces.

Storage spaces typically store two copies of your data so if one of your drives fails, you still have an intact copy of your data. Also, if you run low on capacity, you can add more drives to the storage pool.

After upgrading to Windows 10 Version 2004, May 2020 update, some users are unable to access their Storage Spaces. Pools included in Storage Spaces display their drives as a RAW disk.

Devices using Storage Spaces might have issues using or accessing their Storage Spaces after updating to Windows 10, version 2004 (the May 2020 Update) and Windows Server, version 2004. When using some configurations, partition for Storage Spaces might show as RAW in Disk Manager.

Microsoft is aware about this issue, and has no workaround as of now. The company recommends do not check the drives with Check Disk, and mark your Storage Spaces configuration read-only, as follows.

Mark Storage Spaces read only

  1. Open PowerShell as Administrator.
  2. Within the PowerShell dialog, type the following command and press enter: get-virtualdisk | ? WriteCacheSize -gt 0 | get-disk | set-disk -IsReadOnly $true
  3. Your Storage Spaces should now be set to read only, meaning you will not be able to write to them. Your device will still be usable, and any volume not seen as RAW should be readable.