Disk Management System Disk
The actual hardware that sits underneath the file system.
Large enough to store all user programs and data, application
programs, entire OS
Persistent : - recover from system failures.
Operating system must :-
Manages disk space at low level:-
Keep track of used spaces.
Keep track of unused (free) space
Keep track of “bad sectors”
Handle low level disk functions such as :-
Scheduling of disk operations
Head Movement
File Management System File System
Disk (secondary storage) provide long term storage,
but are unable to use directly
File system provides files and various operations on
files
A file is a long term storage entity, a named collection of
persistent information that can be read or written.
A file system supports directories which contain files and
other directories name, size, data created, data last modified,
owner.
Operating system must :-
Create and delete files and directories
Manipulate files and directories
Read, write, extend, rename, copy, protect
Provide general higher level services
Backup