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*[[Memory mapping]] of files is becoming more dangerous with 32-bit architectures, especially with the introduction of relatively cheap recordable DVD technology. A 4 GB file is no longer uncommon, and such large files cannot be memory mapped easily to 32-bit architectures. This is an issue, as memory mapping remains one of the most efficient disk-to-memory methods, when properly implemented by the OS.
The main disadvantage of 64-bit architectures is that relative to 32-bit architectures the same data occupies slightly more space in memory (due to swollen pointers and possibly other types and alignment padding). This increases the memory requirements of a given process, and can have implications for efficient processor cache utilisation. Maintaining a partial 32-bit data model is one way to handle this, and is in general reasonably effective
==64-bit data models==
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