Refactor disk encryption code.
Cosmetic code changes.
Outsource array functions.
Finish to replace and remove useless sort functions with array_sort_key.
Modify array sort function.
Begin to replace and remove useless sort functions with array_sort_key.
Add universal array_sort_key function.
Rename functions.
Refactor code. Make it more maintainable.
Add API functions to handle configured disks. Helps to keep code maintainable.
