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However, they may have restrictions on the use of certain special characters, disallowing them within filenames; those characters might be used to indicate a device, device type, directory prefix, file path separator, or file type.
File systems typically have directories (also called folders) which allow the user to group files into separate collections.
Choosing an allocation size that is too small results in excessive overhead if the file system will contain mostly very large files.
File system fragmentation occurs when unused space or single files are not contiguous.
In some cases, such as with tmpfs, the computer's main memory (random-access memory, RAM) is used to create a temporary file system for short-term use. Some file systems are "virtual", meaning that the supplied "files" (called virtual files) are computed on request (e.g.
procfs) or are merely a mapping into a different file system used as a backing store.
The most common storage device in use today is a hard disk drive.
Other kinds of media that are used include flash memory, magnetic tapes, and optical discs.
Most modern file systems allow filenames to contain a wide range of characters from the Unicode character set.In computing, a file system or filesystem is used to control how data is stored and retrieved.Without a file system, information placed in a storage medium would be one large body of data with no way to tell where one piece of information stops and the next begins.For example, the ISO 9660 file system is designed specifically for optical discs.File systems can be used on numerous different types of storage devices that use different kinds of media.