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STG_E_CSS_REGION_MISMATCH
DVD region does not match the drive region
STG_E_CSS_REGION_MISMATCH is HRESULT 2147681034 (0x8003030A) from winerror.h. The documented description is “Copy Protection Error - The current DVD's region does not correspond to the region setting of the drive.” The result belongs to CSS-protected playback subject to drive and media region controls. Interpret this result at the native boundary before a wrapper hides the condition that the disc region mask and the drive region setting do not permit playback together.
STG_E_CSS_REGION_MISMATCH means that the disc region mask and the drive region setting do not permit playback together.
Where the result appears
- This result can surface in a DVD CSS authentication, key exchange, protected-sector reading, or region-management logic.
- Map the failure to one concrete operation among IOCTL_DVD_READ_KEY, DVD_COPY_PROTECT_KEY, AGID allocation, challenge and bus keys, title offsets, and region data.
- Preserve physical drive identity, media ID, region state, AGID or session generation, key type, title offset, sector range, and driver stack before releasing or replacing the object that returned this result.
An incident record must distinguish caller, runtime, provider, and backing resource while testing whether the disc region mask and the drive region setting do not permit playback together.
Typical causes and interpretation
The immediate contract boundary is specific: the disc region mask and the drive region setting do not permit playback together. Common cause branches include the following:
- The disc was authored for another region.
- The drive was configured in a different market.
- Virtualized or replacement hardware exposes unexpected region state.
Confirm the cause branch that explains why the disc region mask and the drive region setting do not permit playback together by using call arguments, object state, metadata, device information, or provider traces.
Correct handling and recovery
The primary recovery is to report the region mismatch accurately and use media and hardware permitted by the applicable region policy; do not automate region changes. The failure report should capture the relevant state during CSS-protected playback subject to drive and media region controls so it is clear why the disc region mask and the drive region setting do not permit playback together.
A UI loop must not repeat it without refreshing the state behind “the disc region mask and the drive region setting do not permit playback together” and checking for prior side effects.
Practical scenario
A region-1 disc is inserted into a region-2 drive; the application displays the policy conflict instead of retrying authentication.
Difference from related HRESULTs
STG_E_RESETS_EXHAUSTED concerns inability to change the drive region; it concerns the current disc-drive combination.
Developer and administrator guidance
Use authorized test media to cover fresh sessions, stale AGIDs, title changes, scrambled sectors, region mismatch, and exhausted reset counts.
Dashboards should keep it distinct and attach dimensions that can prove or disprove: the disc region mask and the drive region setting do not permit playback together.
References
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