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STATUS_CSS_REGION_MISMATCH
The disc and drive region state do not match
STATUS_CSS_REGION_MISMATCH is a region-policy failure, not a generic CSS authentication error. Windows exposes IOCTL_DVD_GET_REGION, which reports whether the drive uses RPC2, the current drive region, the region information for the mounted disc, and the remaining user region changes through DVD_REGION.
The T10 ASC/ASCQ table also defines 6Fh/04h MEDIA REGION CODE IS MISMATCHED TO LOGICAL UNIT REGION. Preserve both the Windows region structure and lower device status when available. This makes it possible to distinguish an actual media/drive mismatch from software that selected the wrong device or cached region state before a disc change.
Do not blindly change the drive region as a test. The Windows DVD interface reports a remaining-change count because user region changes are constrained by the device’s RPC policy. First confirm the disc region, drive region and intended playback environment; a CSS challenge retry cannot correct a true region mismatch.
What to inspect
DVD_REGION.RegionData,SystemRegion,ResetCount, and RPC support for the drive.- The mounted disc identity and whether media was changed after region data was cached.
- Lower device ASC/ASCQ when the transport exposes it, especially the explicit region-mismatch indication.
References
- Microsoft: IOCTL_DVD_GET_REGION
- Microsoft: DVD_REGION
- INCITS T10: SCSI ASC/ASCQ assignments
- Microsoft: DVD storage driver interfaces
- Microsoft Open Specifications: NTSTATUS values
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