What does Windows error code 4321 (ERROR_INVALID_DRIVE_OBJECT) mean?

 
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ERROR_REQUEST_REFUSED ERROR_LIBRARY_FULL

ERROR_INVALID_DRIVE_OBJECT

The drive GUID is stale or is not an NTMS_DRIVE object

RSM represents a drive separately from its drive type, containing library and changer. Code that enumerates a drive type or library and later passes that GUID as a concrete drive can trigger this error. A drive object can also disappear after hardware reconfiguration while an old identifier remains in application state.

Enumerate NTMS_DRIVE children of the target library and retrieve object information for the selected GUID. Compare the drive operational state and supported media type with the requested cartridge. Do not confuse a Windows device path with an RSM object GUID; the RSM API uses database identifiers for these operations.

What to inspect

  • Verify dwType is NTMS_DRIVE.
  • Re-enumerate drives under the selected library.
  • Check that the drive is present, enabled and media-compatible.

References


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