What are the advantages of the

The advantage is that while accessing a block that is stored at the middle of a file, its location can be determined by chasing the pointers stored in the FAT as opposed to accessing all of the individual blocks of the file in a sequential manner to find the pointer to the target block. Typically, most of the FAT can be ***d in memory and therefore the pointers can be determined with just memory accesses instead of having to access the disk blocks.