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ERROR_DISK_CHANGE
What ERROR_DISK_CHANGE means
ERROR_DISK_CHANGE is a Win32 system result whose documented message is: “The program stopped because an alternate diskette was not inserted.” In practical troubleshooting, it belongs to removable-media workflows that require a different disk, volume, or image to be inserted before the program can continue. The numeric result identifies the failed contract, while the operation and target object explain why this particular result appeared.
Typical causes
- the application requested the next disk in a multi-volume set but the expected media was not supplied
- drive-letter reuse made the program see the wrong removable volume
- an automated process cannot answer a media-change prompt
How to investigate the result
- record the requested volume label or serial number and the volume actually mounted
- check whether the drive letter changed between prompts
- test the operation in an interactive session to expose hidden media instructions
When investigating this result, start with the first failing call rather than a later cleanup error. Preserve the raw it before any wrapper converts it. Record whether it is reproducible in a clean process, a new user session, or after the relevant object is recreated.
Developer guidance
Validate media identity before continuing and expose an explicit application-level prompt or callback. Services should fail clearly rather than wait indefinitely for physical media. Logs should include the operation name, canonical target, process architecture, operating-system build, and the state that was validated immediately before the call. Avoid blind retries while the same precondition remains unchanged.
Administrator and support guidance
Insert the expected volume, not merely any disk using the same drive letter. For images or virtual media, detach the old image fully before attaching the next one. Before restarting after this result, collect evidence because a restart may clear the state responsible for it. When a it workaround succeeds, record exactly which process, mapping, media, driver, or configuration value changed.
Example incident
A restore utility reads the first archive disk, requests volume two, but automation remounts volume one. The job stops with this result. A useful incident timeline shows the successful setup steps, the first operation returning it, and any secondary errors produced during its rollback.
How it differs from related results
ERROR_MEDIA_CHANGED says the medium changed unexpectedly; it indicates the program stopped because the alternate medium it expected was not provided. That distinction determines whether the remedy belongs in application input, resource release, mapping topology, driver compatibility, or underlying storage.
Evidence worth collecting
Capture evidence around the condition “the application requested the next disk in a multi-volume set but the expected media was not supplied.” The result evidence package should include the exact API or command, all non-secret input fields, normalized paths or device names, object ownership, and a timestamp correlatable with Windows Event Log and application tracing. The first concrete it check should be to record the requested volume label or serial number and the volume actually mounted.
Recovery and verification
Recovery from it is complete only when the original operation succeeds under the same relevant conditions. After fixing it, repeat the action and verify that no stale mapping or handle remains. Run the operation a second time to confirm that the setup and cleanup associated with it are idempotent. If it disappears only after reboot, continue investigating the owner or leaked state rather than treating reboot as the permanent correction.
When to escalate
Escalate it with a minimal reproduction, the exact it value, application and component versions, target path or device class, and the collected state before and after this failure. For a legacy the case, also state whether the executable is 16-bit, DOS-derived, virtualized, redirected, or running under a compatibility subsystem.
References
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