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Encyclopedia > Macintosh File System
MFS
Developer Apple Computer
Full name Macintosh File System
Introduced January 24, 1984 (System 1)
Partition identifier Apple_MFS (Apple Partition Map)
Structures
Directory contents Table
File allocation Linked list
Bad blocks No
Limits
Max file size 256 MiB
Max number of files 4094
Max filename size 255 characters
Max volume size 256 MiB
Allowed characters in filenames Any Apple codepage (such as MacRoman) character but ":"
Features
Dates recorded Creation, modification
Date range January 1, 1904 - February 6, 2040
Date resolution 1s
Forks Only 2 (data and resource)
Attributes version, locked, type, creator, Finder window, location in Finder window, Finder flags
File system permissions No
Transparent compression No
Transparent encryption No
Supported operating systems System 1 — System 7.5.5 (Write), System 8 (Read)

Macintosh File System (MFS) is a volume format (or disk file system) created by Apple Computer for storing files on 400K floppy disks. MFS was introduced with the Macintosh 128K in January 1984. Macintosh File System (MFS) is a volume format (or disk file system) created by Apple Computer for storing files on 400K floppy disks. ... For other uses, see Software developer (disambiguation). ... Apple Inc. ... is the 24th day of the year in the Gregorian calendar. ... This article is about the year. ... This article relates to both the original Classic Mac OS as well as Mac OS X, Apples more recent operating system. ... In computer engineering, hard disk drive partitioning is the creation of logical divisions upon a hard disk that allows one to apply operating system-specific logical formatting. ... Apple Partition Map (APM) is a partition scheme used to define the low-level organization of data on disks formatted for use with Macintosh computers. ... A table is a mode of visual communication that maps the logical structure of a set of data into a hierarchical matrix. ... In computer science, a linked list is one of the fundamental data structures, and can be used to implement other data structures. ... MiB redirects here. ... MiB redirects here. ... The Mac OS Roman character set Mac-Roman encoding is a one byte character encoding system, traditionally used by Mac OS. In Mac OS X, it has been replaced with Unicode. ... In computer file systems, a fork is additional data associated with a file system object. ... Most modern file systems have methods of administering permissions or access rights to specific users and groups of users. ... Filesystem-level encryption, is a form of disk encryption where individual files or directories are encrypted by the file system, in contrast to full disk encryption where the entire partition or disk, where the file system resides, is encrypted. ... An operating system (OS) is the software that manages the sharing of the resources of a computer and provides programmers with an interface used to access those resources. ... Introduction and Definition In the context of computer operating systems, volume is the term used to describe a single accessible storage area with a single filesystem, typically (though not necessarily) resident on a single partition of a hard disk. ... For library and office filing systems, see Library classification. ... Apple Inc. ... A floppy disk is a data storage device that is composed of a disk of thin, flexible (floppy) magnetic storage medium encased in a square or rectangular plastic shell. ... Back case of an unaltered, still-working original Macintosh (sold from January 1984 to September 1984). ... This article is about the year. ...


MFS was notable both for introducing resource forks to allow storage of structured data, and for storing metadata needed to support the graphical user interface of Mac OS. MFS allows file names to be up to 255 characters in length, although Finder does not allow users to create names longer than 63 characters (31 characters in later versions). MFS is called a flat file system because it does not support a hierarchy of directories. To meet Wikipedias quality standards, this article or section may require cleanup. ... Metadata is data about data. ... GUI redirects here. ... This article relates to both the original Classic Mac OS as well as Mac OS X, Apples more recent operating system. ... The Finder is the default application program used on the Mac OS and Mac OS X operating systems that is responsible for the overall user-management of files, disks, network volumes and the launching of other applications. ... For library and office filing systems, see Library classification. ... In computing, a directory, catalog, or folder, is an entity in a file system which can contain a group of files and/or other directories. ...


Folders existed as a concept on the original MFS-based Macintosh, but worked completely differently from the way they do on modern systems. They were visible in Finder windows, but not in the open and save dialog boxes. There was always one empty folder on the volume, and if it was altered in any way (such as by adding or renaming files), it would be replaced with a new Empty Folder. MFS stored all of the file and directory listing information in a single file. The Finder created the "illusion" of folders, by storing all files as a directory handle/file handle pair. To display the contents of a particular folder, MFS would scan the directory for all files in that handle. There was no need to find a separate file containing the directory listing. Finder may be: A device attached to a telescope which gives a much larger field of view than the main telescope and so allows an astronomer to centre the telescope on an object using crosshairs. ... Example of dialog box from Microsoft Windows Dialog boxes are special windows which are used by computer programs or by the operating system to display information to the user, or to get a response if needed. ...


The Macintosh File System did not support volumes over 20 megabytes in size, or about 1,400 files. While this is small by today's standards, it seemed very expansive when all Apple Macintosh computers at the time had a 400 kilobyte floppy drive. ReBoot character, see Megabyte (ReBoot). ... The first Macintosh computer, introduced in 1984, upgraded to a 512K Fat Mac. The Macintosh or Mac, is a line of personal computers designed, developed, manufactured, and marketed by Apple Computer. ... A kilobyte (derived from the SI prefix kilo-, meaning 1,000) is a unit of information or computer storage equal to either 1,000 bytes or 1,024 bytes (210), depending on context. ...


Apple introduced Hierarchical File System as a replacement for MFS in September 1985. In Mac OS 7.6.1, Apple removed support for writing to MFS volumes, and in Mac OS 8 support for MFS volumes was removed altogether. Although Mac OS X has no built-in support for MFS, an example VFS plug-in from Apple called MFSLives provides read-only access to MFS volumes. Hierarchical File System (HFS), is a file system developed by Apple Computer for use on computers running Mac OS. Originally designed for use on floppy and hard disks, it can also be found on read-only media such as CD-ROMs. ... This article is about the year. ... System 7 (codenamed Big Bang) was a version of Mac OS, the operating system of the Apple Macintosh computer. ... Mac OS 8 is a series of versions of the Mac OS that supported a transition through major changes in the Macintosh hardware platform. ... Mac OS X (IPA: ) is a line of graphical operating systems developed, marketed, and sold by Apple Inc. ...


See also

The following tables compare general and technical information for a number of file systems. ...

References

  • Apple Computer, Inc. (1985). Inside Macintosh Volume II. New York: Addison-Wesley. ISBN 0-201-17732-3.

External links

  • Apple Tech Article 9502 - MFS volume support in Mac OS 7.x
  • MacTech Volume 1, Issue 5: Disks - organization of the standard Macintosh disk (April 1985)
  • Resurrecting MFS Macintosh Floppies
  • Fred's Follies - HFS used in Macs with 128K ROMs different from MFS used in Macs with 64K ROMs
  • Q&A: Mac Plus - limitation due to MFS on an external 400K floppy drive disk
  • MFSLives - VFS read-only plug-in for MFS in Mac OS X

  Results from FactBites:
 
File system - Wikipedia, the free encyclopedia (2606 words)
File systems may use a storage device such as a hard disk or CD-ROM and involve maintaining the physical location of the files, or they may be virtual and exist only as an access method for virtual data or for data over a network (e.g.
The file system software is responsible for organizing these sectors into files and directories, and keeping track of which sectors belong to which file and which are not being used.
A disk file system is a file system designed for the storage of files on a data storage device, most commonly a disk drive, which might be directly or indirectly connected to the computer.
Macintosh File System - Wikipedia, the free encyclopedia (445 words)
MFS was introduced with the Macintosh 128K in January 1984.
MFS is called a flat file system because it does not support a hierarchy of folders.
Apple introduced Hierarchical File System as a replacement for MFS in September 1985.
  More results at FactBites »

 
 

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