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ERROR_MESSAGE_EXCEEDS_MAX_SIZE
The supplied RSM message exceeds its fixed maximum length
RSM operator-request and object-information structures use fixed-size text fields. A message that is valid Unicode text can still be rejected because it does not fit the API structure, especially when an application constructs verbose diagnostic instructions for an operator request. This is a parameter-size problem and does not indicate a failed library or media operation.
Measure the encoded string against the corresponding ntmsapi structure limit before making the call. Keep the actionable operator instruction in the RSM message and place extended diagnostics in application logs. Preserve null termination and use the matching Unicode API variant to avoid size calculations based on the wrong character width.
What to inspect
- Check the documented field size for the exact structure.
- Account for the terminating character.
- Move long diagnostics to logs and keep the operator message concise.
References
- Microsoft: RSM operator-request types and states
- Microsoft: RSM object types, GUIDs and operational state
- Microsoft: Removable Storage Manager API
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