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VDS_E_NO_DRIVELETTER_FLAG
This HRESULT concerns provider support for VDS_VF_NO_DEFAULT_DRIVE_LETTER. The flag controls whether Windows automatically assigns a drive letter when a volume is added, but its scope differs between MBR basic disks, GPT basic disks, and dynamic disks. Microsoft also documents version-specific behavior for dynamic volumes on Windows Server 2003.
Why this state matters
The flag is not the same as deleting an existing access path. On some layouts, changing it affects a specific volume; on an MBR basic disk, related volume flags can apply at disk scope. A provider that does not support the flag must not be worked around by assuming that removing the current drive letter permanently disables future automatic assignment.
Diagnostic focus
- Record the disk partition style, basic/dynamic model, provider identity, and requested flag mask.
- Distinguish “no default drive letter” policy from current drive-letter or mounted-folder access paths.
- Check the documented scope rules before changing flags on an MBR basic disk.
- If the provider rejects the flag, use a documented access-path policy for that environment rather than emulating the flag with one-time drive-letter removal.
Technical references
VDS_VOLUME_FLAG · IVdsVolume::SetFlags · IVdsVolume::ClearFlags · VDS common return codes · MS-VDS error codes
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