Article ID: 295579 - View products that this article applies to.
This article was previously published under Q295579
When you try to play a DVD, you may be unable to do so, and you may receive an error message that relates to your third-party DVD decoder program or your hardware Motion Pictures Expert Group (MPEG) decoder.
This issue can occur if the DVD you want to play contains a .vob file that is too large. As of June 26, 2001, the most common file types that are used by DVD manufacturers have a .vob or .dat file extension, and the DVD-Video standard only allows single extent files. An extent descriptor under the Universal Disk Format (UDF) standard can only describe 1 gigabyte (GB), and larger files need more descriptors.
UDF uses a 32-bit integer as the size of an extent, the top two bits of which are reserved, so there is a maximum extent size of 2^30 - 1. MPEG2 data is normally written a block at a time, and this means that the block size is 2^30 (or 1GB-2KB). Because of this, if the .vob file size is greater than or equal to 1,073,741,824 bytes (the block size), the .vob file is not playable.
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