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ERROR_PARTIAL_COPY
Only part of the requested memory was copied
ERROR_PARTIAL_COPY is commonly returned by process-memory APIs when part of the requested range is inaccessible, unmapped, changing, or incompatible with the caller's assumptions.
What to check
- Record the target process, address, requested size, and transferred size.
- Validate memory regions with the appropriate query API.
- Account for pages changing protection or being unmapped concurrently.
- Check 32-bit and 64-bit address-size assumptions.
How to handle it
Process the transferred byte count explicitly. Retry only stable subranges and avoid treating partially read structures as complete valid data.
References
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