ERROR_LOG_BLOCK_INCOMPLETE - 6603 (0x19CB)
Log service encountered a partial or incomplete log block.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_LOG_BLOCK_INCOMPLETE error code indicates that the log service has encountered a partial or incomplete log block. This typically suggests an issue with the structure of the log data, possibly due to corruption or an unexpected termination during logging operations.
Error Details
This error is specific to the Windows event logging system and can occur when attempting to read or process log entries from the event viewer or other logging utilities. The presence of a partial block may indicate that the logging operation was interrupted before completion, leading to incomplete data in the log file.
Usage Context
The ERROR_LOG_BLOCK_INCOMPLETE error is commonly encountered during operations such as reading logs, flushing logs, or when the system attempts to recover from an unexpected shutdown. It can also appear when using tools like wevtutil for managing event logs.
Developer Interpretation
Developers should interpret this error as a signal that there may be incomplete log entries in the current log file. This could lead to missing information or inconsistencies in the logged data, which might affect the accuracy of any analysis based on these logs.
Related Errors
ERROR_LOG_CORRUPTION(672)ERROR_LOG_READ_IN_PROGRESS(1930)ERROR_LOG_WRITE_IN_PROGRESS(1931)
FAQ
Q: What does the ERROR_LOG_BLOCK_INCOMPLETE error mean?
A: It indicates that a log block in the event log is incomplete, likely due to an interruption during logging operations.
Q: How can I resolve this issue?
A: Ensure that all logging operations are completed before shutting down or restarting the system. Use tools like wevtutil to manage and recover from partial logs if necessary.
Summary
The ERROR_LOG_BLOCK_INCOMPLETE error is a specific indication of an incomplete log block in the Windows event logging system. Developers should be aware that this can lead to missing data and should take steps to ensure proper handling of logging operations to avoid such issues.