The storage system of computers includes primary memory and secondary memory. Primary memory or Random Access Memory (RAM) or temporary memory is the main memory of computer, which is used to store data temporarily while the secondary memory provides a means of permanently storing the information. Memory is a circuitry that allows information to be stored and retrieved. In general, memory can refer to external systems such as disk or tape drives. It is basically the fast semiconductor storage or RAM, which is directly connected to the processor. The two types of memories are:
Introducing Secondary Memory
There are several types of secondary storage devices. The most common type of secondary storage device is disk. It is the permanent storage medium for either storing data or a program. The disk can be an internal hard disk, which is housed within the system unit or an external floppy disk. In addition, the Compact Disk - Read Only Memory (CD-ROM) is another type of secondary storage device commonly available in all the computer systems. The data storage devices include:
• Universal Serial Bus (USB) Drive