Compressor can encode content for digital video discs in standard definition (SD DVD) and high definition (HD DVD).
SD and HD DVD Parameters
Understanding Disc Capacity
Only 4.3 GB of data fits on a 4.7 GB DVD. The discrepancy arises because DVD manufacturers use decimals to calculate 1 GB as 1 billion bytes (1000 × 1000 × 1000). Computer data storage, on the other hand, is calculated using a binary byte system (in which 1 KB is actually 1024 bytes) when written to DVD media. That roughly equals a 7 percent difference when the two systems are compared: 4.7 GB media will hold only 4.37 GB of data.
The same applies ...
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