What does Windows error code 329 (ERROR_OPERATION_IN_PROGRESS) mean?

 
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ERROR_OPERATION_IN_PROGRESS

A conflicting device operation is already running

ERROR_OPERATION_IN_PROGRESS means the requested device action cannot start because another operation has not completed. Firmware updates, maintenance, formatting, sanitize operations, or long-running commands may serialize access.

Checks

  • Query the status of the earlier operation.
  • Prevent duplicate submissions from multiple workers.
  • Use a single owner for exclusive maintenance commands.
  • Apply a realistic timeout based on the device operation.

Handling

Wait or poll according to the documented protocol, then retry once the active operation finishes. Do not cancel blindly when interruption could leave the device in an unsafe state.

References


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