What are primary storage devices?
Storage device is a piece of electronic hardware created for data storage. Some storage devices have storage as their only function, while others are actually a multifunctional device that can store data and perform other roles. The storage device is divided into primary storage devices and secondary storage devices, but there are two different ways to consider which devices are primary and which are secondary. In one perspective, while the current data is stored in primary storage devices, data that is currently not approached is stored in secondary storage devices, with all these devices on computer. In the second glance, all storage devices that are part of the computer, primary storage devices, while any storage that is peripheral is what is referred to as secondary storage devices. RAM holds data that is immediately available to the CPU (central processing unit) to which it is directly connectedn. Data in RAM is the data that has been loaded by the operating system and active programs, and requires electric current to maintain there.
On the other hand, the computer's hard disk is a secondary storage in this perspective because it is not directly connected to the CPU. Since it stores data magnetically, the hard disk data will persist after the computer is switched off, while the data in RAM will be lost after the computer is switched off because the electric current will no longer be available.
In the second perspective, in which the primary storage includes all original storage of the computer - both RAM and hard drives - secondary storage devices may be a number of other types of storage and media that are external. This type of secondary storage device may include additional internal units, external hard drives, floppy disks, tape storage and inch unit. In terms of optical units, secondary storage devices may include CD and DVD and other optical media. Since the internal hard disk of the computer can be considered as a primary storage device or secondary storage device, depending on which view is accepted, it is important to be clear in the discussion of primary and secondary storage devices not to understand.