Secondary Storage Devices The primary storage of today’s computer systems has the following limitations: 1. Limited capacity: It is often necessary to store many millions, sometimes billions, and even trillions, of bytes of data in a computer. Unfortunately, the primary storage capacity of today’s computers is insufficient to store the large volume of data handled by most data processing centres. 2. Volatile: Primary storage is volatile and loses data stored in it in case of power off or interruption of power. However, computer systems must keep data permanently for several days, months, or even years. Almost all computers use additional memory called Auxiliary memory or Secondary storage to overcome these limitations of primary storage. Secondary storage is non-volatile and has a lower cost per bit but generally operates at speeds far slower than that of primary storage . Computer systems use it primarily to permanently store a large volume of data, which they...