ExaArray is a .NET library for exa-scale array-like structures. By using this library, it becomes possible to add up to 4.4 quintillion i.e. 4,410,000,000,000,000,000 elements into one array. When using byte for T, this would need approx. 3.8 EB of memory.

Extending the data structure performs as O(n) with O(m+n) of memory. Accessing the data performs as O(1), though. For the generic type T, any .NET type can be used: The ExaArray uses managed memory.