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All records of an endgame are simply organized as two arrays (one array for one side/color). In other words, each item in those arrays is an integer and its index on an array is mapped to a unique position. For a given chess position, we will calculate its index then access its data record/integer via that index without searching.
==EGTB files==
Those arrays of an endgame can be stored in files. Typically each array is stored in one file. However, sometimes they can be combined into one file or device into more files to be easy to copy or manage. Those files may be in the form of none or compressed. If they are compressed, they are divided and compressed by small blocks thus they don't need to decompress all to extract data of just a few positions.
==In memory==
Some chess engines create themselves an EGTB on-flight and keep all data in memory without saving/loading to files. Due to limit by initial time they can generate and use very small EGTBs only.
==Sizes==
The size of an endgame depends on:
* The number of involving pieces: more pieces, the bigger size
