Suppose that a disk drive has 6,000 cylinders, numbered 0 to 5,999. The drive is currently serving a request at cylinder 3,250, and the previous request was at cylinder 4,805. The queue of pending requests, in FIFO order, is: 1515, 1212, 1296, 3800, 544, 618, 356, 2523, 5965, 4681 Starting from the current head position, what is the total distance (in cylinders) that the disk arm moves to satisfy all the pending requests for each of the following diskscheduling algorithms? a. FCFS b. SSTF c. SCAN d. LOOK

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Hash Table

A hash table also called a hash map, is a data structure that maps key-value pairs. The hash table can be used in complex systems to provide fast access and compact storage. A hash table is a structure that stores data in an abstract data type kind of associative array. It keeps data in an array format, with a distinct index value for every data value. If the index of the required data is known, then the data can be accessed very easily.