Journaled File Systems

A journaled file system is a method used by computers to keep data safe and consistent. Before making changes to files, it records a summary of these changes in a special log called a journal. If the system crashes or loses power during an update, it can refer to this journal to accurately restore data to its correct state, preventing corruption. This process ensures reliable data storage, reduces recovery time after failures, and maintains overall system integrity—a critical feature for systems requiring high data reliability like servers and crucial applications.