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Internal And External Storage Devices Of Computer Pdf

internal and external storage devices of computer pdf

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Computers use main memory such as random access memory RAM and cache to hold data that is being processed. However, this type of memory is volatile - it loses its contents when the computer is switched off. General purpose computers , such as personal computers and tablets, need to be able to store programs and data for later use.

In computing , external storage comprises devices that store information outside a computer. Such devices may be permanently attached to the computer, may be removable or may use removable media. Optical storage devices have media that use laser light technology for data storage and retrieval. Its speed is much faster than CD but not as fast as hard disk. The standard DVD-5 technology has a storage capacity of 4.

External storage

Alternatively referred to as digital storage , storage , storage media , or storage medium , a storage device is any hardware capable of holding information either temporarily or permanently. The picture shows an example of a Drobo , an external secondary storage device.

There are two types of storage devices used with computers: a primary storage device, such as RAM , and a secondary storage device, such as a hard drive. Secondary storage can be removable , internal , or external. Today, magnetic storage is one of the most common types of storage used with computers. This technology is found mostly on extremely large HDDs or hybrid hard drives. Another common type of storage is optical storage , which uses lasers and lights as its method of reading and writing data.

Flash memory has replaced most magnetic and optical media as it becomes cheaper because it is the more efficient and reliable solution.

Storing data online and in cloud storage is becoming popular as people need to access their data from more than one device. Early computers had no method of using any of the technologies above for storing information and had to rely on paper. Today, these forms of storage are rarely used or found.

In the picture is an example of a woman entering data to a punch card using a punch card machine. A hard copy is considered a form of paper storage, although it cannot be easily used to input data back into a computer without the aid of OCR. Without a storage device, a computer cannot save or remember any settings or information and would be considered a dumb terminal. Although a computer can run with no storage device, it would only be able to view information, unless it was connected to another computer that had storage capabilities.

Even a task, such as browsing the Internet, requires information to be stored on your computer. As computers advance, the technologies used to store data do too, with higher requirements for storage space.

Because people need more and more space, want it faster, cheaper, and want to take it with them, new technologies have to be invented. When new storage devices are designed, as people upgrade to those new devices, the older devices are no longer needed and stop being used.

For example, when punch cards were first used in early computers, the magnetic media used for floppy disks was not available. Today, we have smartphones that have hundreds of times the capacity at a much smaller price that we can carry in our pocket.

Each advancement of storage devices gives a computer the ability to store more data, and save and access data faster. When saving anything on a computer, it may ask for a storage location , which is the location information is saved. By default, most information is saved to your computer hard drive. If you want to move the information to another computer, save it to a removable storage device, such as a USB flash drive.

Most of the storage devices mentioned above are no longer used with today's computers. Most computers today primarily use an SSD to store information, and the ability to use USB flash drives and access to cloud storage. Most desktop computers and some laptops include a disc drive that is capable of reading and writing CDs and DVDs.

For most computers, the largest storage device is the hard drive or SSD. However, networked computers may also have access to larger storage with large tape drives , cloud computing , or NAS devices. Below is a list of storage devices from the smallest capacity to the largest capacity.

Many storage devices have been available in many different capacities. For example, over the evolution of the hard drive, their storage capacity has increased from 5 MB to several terabytes in size. Therefore, the list below is only meant to provide a general idea of the size difference between each storage device, from smallest to largest storage capacity.

There are exceptions to the list. Although these devices do send and receive information, they are not considered an input device or output device. It is more proper to refer to any device capable of storing and reading information as a storage device, disk , disc , drive , or media. Accessing a storage device on your computer depends on the operating system your computer uses and how it's being used. For example, with Microsoft Windows, you can use a file manager to access the files on any storage device.

Microsoft Windows uses Explorer as its default file manager. With Apple computers, Finder is considered the default file manager.

One of the most recent storage device technologies to be introduced is NVMe , with SSDs and cloud storage also being recently developed storage devices. Also, older technologies, like hard disk drives and tape drives, are always developing new techniques to allow for the devices to store more data.

Home Dictionary S - Definitions. Examples of computer storage Why is storage needed in a computer? Why so many different storage devices? What is a storage location? Which storage devices are used today? What storage device has the largest capacity? Are storage devices input and output devices?

How do you access storage devices? What is the latest storage device? Related pages. Hard drive help and support. Note A hard copy is considered a form of paper storage, although it cannot be easily used to input data back into a computer without the aid of OCR. Note Many storage devices have been available in many different capacities. Related pages How to find how much hard drive space is available.

How much is 1 byte, kilobyte, megabyte, gigabyte, etc.? Was this page useful?

Storage device

There are mainly two types of memory in computers — Internal and External memory. The purpose of memory is to store programming operations, data, and set of instructions to run an operating system. Moreover, memory is also helpful in storing permanent and temporary files inside the computer. These files are accessible by the operating system as and when there is any need. In computing, internal and external memory, both save and access data files but have different physical and working characteristics.


Storage Devices. • A storage device is used in the computers to store Internal Hard disk. External Hard mount (insert) and dismount removable mass storage​.


internal and external memory of computer pdf

It is working memory of the computer. Internal fragmentation occurs when memory is divided into fixed sized partitions. As soon as the machine is switched off, data is erased. Internal memory corresponds to what we call random access memory RAM. Speakers Home External 7.

It can store data in various form as text, graphics, digital images etc. CPU Home Internal The user of a computer continuously load and unload the processes from the main memory.

Computer Assisted Language Learning and Teaching. Unit 2. Computer basics I. Please read. Davies, G.

Isaac Computer Science

Alternatively referred to as digital storage , storage , storage media , or storage medium , a storage device is any hardware capable of holding information either temporarily or permanently. The picture shows an example of a Drobo , an external secondary storage device. There are two types of storage devices used with computers: a primary storage device, such as RAM , and a secondary storage device, such as a hard drive. Secondary storage can be removable , internal , or external.

Most computers have some form of internal storage. The most common type of internal storage is the hard disk. At the most basic level, internal storage is needed to hold the operating system so that the computer is able to access the input and output devices. It will also be used to store the applications software that you use and more than likely, the original copies of your data files. Internal storage allows the data and applications to be loaded very rapidly into memory, ready for use.

The picture is an example of a Drobo and an example of a popular external storage solution.. Characteristics of Memory Hierarchy are following when we go from top to bottom. Do you watch movies on DVD or Blu-ray? External storage vs.

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Difference between Internal and External Memory

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