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A format program is a type of software that prepares a disk for reading and writing data on a system. A format program is responsible for wiping out all logged information from the disk, performing checks to make sure the disk sections are not faulty, assigning flags to bad sectors, and creating internal tables that are later used for the location of addressable data.
A disk must be formatted before it can be used. A format program performs all the necessary tasks before a disk can be used for the purpose of storing, reading and writing data. It is important to know the difference between high-level and low-level formatting. A format program is responsible for only high-level formatting of the disk, because in most cases disks are already low-level formatted. High-level formatting changes the address table and checks for errors in memory addressing and location without the underlying details such as physical tracks and storing sector identification in them.