To enable users to access files by name:
--------> The system must first utilize the user-supplied filename
-------------> Query the file directory
-------------> Find the file control block FCB of the file
---------------> (For UNIX systems, it is necessary to find the inode of the file,
-----------------> Then according to the physical address of the file recorded in the found FCB, and according to the physical organization of the file, find out the disk block number of the file
------------------>And then convert the physical location of the file on the disk
---------------------> Finally start the disk driver to read the file into memory