Retrieving media information and updating files carbon dating old testament
In some operating systems a system administrator may use disk quotas to limit the allocation of disk space.
A filename (or file name) is used to identify a storage location in the file system.
Other kinds of media that are used include SSDs, magnetic tapes, and optical discs.
It is responsible for arranging storage space; reliability, efficiency, and tuning with regard to the physical storage medium are important design considerations. This layer is concerned with the physical operation of the storage device (e.g. It processes physical blocks being read or written.
It handles buffering and memory management and is responsible for the physical placement of blocks in specific locations on the storage medium.
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 (such as procfs and sysfs) or are merely a mapping into a different file system used as a backing store.
The file system manages access to both the content of files and the metadata about those files.
This creates alternating used and unused areas of various sizes. When a file is created and there is not an area of contiguous space available for its initial allocation the space must be assigned in fragments.