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ERROR_OFFSET_ALIGNMENT_VIOLATION
The requested offset violates alignment requirements
ERROR_OFFSET_ALIGNMENT_VIOLATION occurs when an I/O command uses an offset that is not aligned to the device’s required granularity. Direct and unbuffered I/O paths expose this requirement more often than buffered file access.
Checks
- Query logical and physical sector alignment.
- Validate the file offset, transfer length, and buffer address together.
- Account for partition and storage-stack alignment offsets.
- Do not assume a fixed 512-byte sector size.
Fix
Round or split requests according to the reported alignment contract, using an aligned buffer when required. Preserve unaffected bytes during read-modify-write handling.
References
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