Case preservation

In file systems, case preservation is the preservation of the letter case (uppercase or lowercase) of letters in file names.

If an attempt is made to create a file named "ThisIsAFile" on a file system that does not preserve letter case, the file's name will be "thisisafile" if letters are stored as all lowercase or "THISISAFILE" if letters are stored as all uppercase.

For example, a reference to the "uNiTeD states oF AMERICA" is understood to mean the United States of America, even though the capitalization is incorrect.

[2] In a non-case-preserving system, arbitrary capitalization may be used by the system for storage and display, such as for example all letters being store in lowercase (or alternatively all in uppercase).

For example, in Oracle Database, a table created with the name CustomersRegion1 will be stored as CUSTOMERSREGION1 (unless it is created under the name "CustomersRegion1", which means that the identifier will be treated as case-sensitive, and therefore must be referenced with that exact casing).