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ERROR_VOLUME_MOUNTED
A file system mounted a new volume
ERROR_VOLUME_MOUNTED corresponds to Win32 error value documented as: A new volume has been mounted by a file system. A volume became accessible through the storage stack and may now receive drive letters, mount points, file-system notifications, and application access. The event can follow insertion, unlock, repair, or virtual-disk attachment.
Where the result appears in real systems
- Removable media.
- BitLocker unlock.
- VHD attachment.
- Cluster storage arrival.
- File-system filter mount callbacks.
What to collect before making changes
Record volume GUID, device path, file-system type, serial number, mount points, and whether the volume is read-only; correlate disk and filter-driver events; avoid relying solely on a drive letter.
Handling and recovery
Initialize per-volume state once, validate trust and policy before scanning, and handle later dismounts. Services should use volume GUIDs because drive letters can be absent or reassigned.
What not to infer from this code
This result is a lifecycle notification. It does not imply that every directory is readable or that the file system is healthy.
References
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