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STATUS_CSS_SCRAMBLED_SECTOR
The failed read reached encrypted DVD content, not an ordinary unprotected sector
STATUS_CSS_SCRAMBLED_SECTOR narrows a DVD read failure to CSS-protected content. Windows exposes copyright information through DVD structure descriptors and handles copy-protection keys through a separate session/key interface. The status means the read encountered encrypted sector data; it should not be flattened into the same diagnosis as a generic media I/O error.
Correlate the sector address with the copy-protection sequence that preceded the read. A session can exist while the key needed for the requested content has not been established, and title-key context can matter when software moves between protected content areas. Conversely, if the same location also produces lower-level read or device errors, preserve those results rather than assuming CSS is the only problem.
A useful trace records the logical block range, whether the disc reports copy-protected content, the active AGID, and the key operations immediately before the read. Retrying the sector without restoring the correct CSS state usually reproduces the same encrypted-sector result and provides little diagnostic value.
What to inspect
- The exact sector range and whether the failure begins at a transition into protected content.
- The active DVD session and key types obtained before the read, especially any title-key operation.
- The DVD copyright descriptor and lower storage completion data so CSS state is separated from physical read failure.
References
- Microsoft: DVD_COPYRIGHT_DESCRIPTOR
- Microsoft: IOCTL_DVD_READ_STRUCTURE
- Microsoft: IOCTL_DVD_READ_KEY
- Microsoft: DVD_COPY_PROTECT_KEY
- Microsoft Open Specifications: NTSTATUS values
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