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In common region-locked DVDs (but not in RCE-DVDs), the region code is stored in the file "VIDEO_TS.IFO" (table "VMGM_MAT"), byte offsets 34 and 35. [13] The eight regions each correspond to a value which is a power of 2: Region 1 corresponds to 1 (2 0 ), Region 2 to 2 (2 1 ), Region 3 to 4 (2 2 ), and so on through Region 8, which corresponds ...
In modern DVD drives (type RPC-2), the region lock is saved to its hardware, so that even reinstalling Windows or using the drive with a different computer will not unlock the drive again. Unlike DVD regions, Blu-ray regions are verified only by the player software, not by the computer system or the drive.
The drive treats a DVD-Video disc as any DVD-ROM disc. The player reads the disc's user-data and processes them according to the DVD-Video format. However, if the drive detects a disc that has been compiled with CSS, it denies access to logical blocks that are marked as copyrighted (§6.15.3 [ 4 ] ).
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Unlike DVD region codes, Blu-ray region codes are verified only by the player software, not by the optical drive's firmware. As of 2017 the latest types of Blu-ray players, suitable for Ultra HD Blu-ray content, are not region-free, but Ultra HD Blu-ray disc manufacturers have not yet locked the discs to any region and they work worldwide.
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Xbox (DVD) Two sets of media descriptors are used. Initially, and on typical DVD-ROM drives, only a short partition containing a brief DVD Video can be seen. The lead-out section of the disk stores a second set of media descriptors describing the bounds of the main partition. It also contains a partially-encrypted "security sector" used for ...