AtheOS File System AFS Developer Full name Introduced ( ) Partition identifier Structures Directory contents File allocation Bad blocks Limits Max file size Max number of files Max filename size Max volume size Allowed characters in filenames Features Dates recorded Date range Forks Attributes File system permissions Transparent compression Transparent encryption Supported operating systems { { { OS } } } The AtheOS file system ( AFS ) was originally used in the AtheOS operating system , and is now a part of the Syllable operating system.AFS started with exactly the same data structures as BFS , and extended the feature set of BFS in many ways . As such , AFS is a 64-bit journaled file system with support for file attributes . File indexing and soft deletions are also partially supported . A few definitions : Journaled -- All file system transactions are first written to a journal before they are carried out . The file system replays everything in the journal when mounted . So , if something catastrophic occurs while data 's being written to the file system , the file system can recover . File Attributes -- Name/value pairs tacked on to a file . For example , an audio file might have attributes for Artist , Title , and Album . This allows the file system to search files in intelligent and flexible ways ( such as a search for all songs by Elton John that exist on the hard drive ) . File Indexing -- A persistent and up-to-date list of all files that have a particular attribute , and the value of that attribute . So , the system may have an index for the Artist attribute on MP3 files . This speeds up searching , but slows down system performance when large numbers of files are created . Soft Deletions -- When the file system is told to delete a file , the file is actually hidden , and removed later by other means . In AFS , files are moved to an invisible directory and only deleted when the file system is next mounted . External links Syllable homepage AtheOS homepage Notes on AtheOS AtheOS info site  This computer storage -related article is a stub . You can help Wikipedia by expanding it . Categories : Computer storage stubs | Disk file systems In other languages : Lietuvių | Polski AFS 