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VDS_E_LEGACY_VOLUME_FORMAT
VDS_E_LEGACY_VOLUME_FORMAT is documented as detection of a partition with an unknown type on the selected disk. Despite the word “format” in the constant, the VDS return-code text is about partition type and disk layout, not a request to format a volume.
Preserve unknown partition metadata before migration
An unknown partition type may represent a layout that the VDS software provider cannot safely classify for the requested migration or conversion. Deleting that partition merely to make the operation proceed can destroy vendor, recovery, or non-Windows data. First inventory the partition table and identify the owner of the unknown type.
What to verify
- Capture the complete partition layout, including partition style, type identifiers, offsets, and sizes.
- Compare the target disk with the disk intended by the management workflow; stale disk numbering can make an unfamiliar partition appear unexpectedly.
- Use a migration path that explicitly supports the discovered layout, or back up and recreate the disk only after the unknown partition has been accounted for.
References
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