File Concept Access Methods Directory Structure File-System Mounting File Sharing Protection To explain the function of file systems To describe the interfaces to file systems To discuss file-system design tradeoffs, including access methods, file sharing, file locking, and directory structures To explore file-system protection .File Concept Contiguous logical address space Types: Data numeric character binary Program None - sequence of words, bytes Simple record structure Lines Fixed length Variable length Complex Structures Formatted document Relocatable load file Can simulate last two.