ERROR_CLUSTER_PARTIAL_READ - 5921 (0x1721)
An error occurred while reading from a stream of data. An unexpected number of bytes was returned.
Updated: Feb 21, 2026
Technical Meaning
The error code ERROR_CLUSTER_PARTIAL_READ with the numeric value 5921 and hexadecimal representation 0x1721 indicates an issue encountered during a read operation from a data stream. Specifically, it signifies that an unexpected number of bytes was returned, which deviates from the expected outcome.
Error Details
This error typically arises in scenarios where a read operation is performed on a cluster-based storage system or file system. Clusters are logical units of storage used by certain file systems to manage data allocation and ensure efficient use of disk space. When a read request is issued, it expects to receive the exact number of bytes requested; however, if fewer bytes than expected are returned, this error is generated.
Usage Context
The ERROR_CLUSTER_PARTIAL_READ can occur in various contexts where cluster-based storage systems or file operations are involved. Common scenarios include:
- File system operations on volumes that use a clustered file system (e.g., Windows Failover Clustering).
- Networked file access through protocols like SMB, which may involve reading data from shared resources.
Developer Interpretation
Developers should interpret this error as an indication that the read operation did not complete successfully due to an unexpected number of bytes being returned. This could be indicative of a variety of issues such as corrupted data, incorrect parameter values, or limitations in the system's ability to handle the request.
Related Errors
- ERROR_READ_FAULT (0x0000001b): Indicates a read operation failed due to a hardware fault.
- ERROR_WRITE_FAULT (0x00000023): Similar to
ERROR_CLUSTER_PARTIAL_READ, but for write operations. - ERROR_HANDLE_EOF (0x0000008d): Occurs when an end-of-file condition is encountered during a read operation, which might be related in some cases where the expected data was not fully available.
FAQ
Q: What does ERROR_CLUSTER_PARTIAL_READ mean?
A: It indicates that a read operation returned fewer bytes than expected from a cluster-based storage system or file stream.
Q: How can I troubleshoot this error?
A: Review the context of the read operation, validate parameters, and ensure data integrity. Consider checking for any hardware issues or limitations in the system's ability to handle the request.
Summary
The ERROR_CLUSTER_PARTIAL_READ is a generic error code that indicates an issue with a read operation returning fewer bytes than expected from a cluster-based storage system. Developers should interpret this as a potential sign of data corruption, incorrect parameters, or limitations in the system's handling capabilities. Understanding and addressing these issues can help resolve the problem.