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Contiguous file allocation

Contiguous Allocation:
 This method stores each file as a contiguous block of data on the disk.
 Allocation is done using first fit or best fit.
 This method has minimal or no disk-head movement.
 Due to minimal seek time, the access time of a file and the I/O performance is greatly improved in this method.
 It allows random access.
 It can be used for both sequential and direct files.

 Finding space for a new file or a resized file.
 Determining size requirements.
 External fragmentation of the hard disk.

Image result for contiguous allocation in files in OS image