storage mediumis a device for recording (storing)Information(Data). Recording can be done with virtually any form of energy. A storage device is a hardware device that can storeInformation. There are twostorage devicesused in computers; a primary storage device such asComputerRAM and a secondary storage device such asComputer hard disk.
main memory: – Primary storage is a storage location that holdsmemoryfor a short time while the computer is on. For example, computer RAM (random accessmemory) and cache are both examples of a primary storage device. This type of memory is the fastest type of memory in your computer and is used to store data while using it. For example, when you open a program, data is moved from secondary storage to primary storage. It is also referred to as internal storage and main storage.
secondary storage: – Secondary storage is a storage medium that holds information until it is erased or overwritten, regardless of whether the computer is powered. For example aDiskettedrive andhard diskare both good examples of secondarystorage devices. As can be seen from the image below, there are three different types of memory on a computer, although primary memory is accessed much faster than secondary memory due to price and size limitations. Secondary storage is used on today's computers to store all your programs and your own personal data.
It is also known as external storage and auxiliary storage. The offline storage in Fig could be considered as secondary storage, we have put this in its own category as these media types can be easily removed from the computer and stored elsewhere.
Diskette : It is a circular disc coated with magnetic oxide and surrounded by a square plastic cover (jacket). It comes in a variety of sizes, but the most commonly used floppy disk is 3½. It can store data up to 1.44 MB. Data is written on the disk surface as tiny magnetic spots, creating new data or data previously stored in that location to erase the disk surface. Floppy disks are available in 2 sizes, 3.5 inch and 5.25 inch. Mostly the 3.5 inch floppy disk is used. The 5.25" diskette is stored in a flexible case and is not secure. It can store about 1.2MB of data.
Hard disk :Hard drives are made of aluminum or other metal alloys coated on both sides with magnetic material. Unlike floppy disks, Hark disks cannot be removed from the computer. To conserve storage capacity, multiple disks are packaged together and mounted on a common drive to form a disk pack. A plate is also called a plate.
Magnetic tape:Magnetic tapecan be used to perform both functions - input and output.Magnetic tape is asecondary storage media.Magnetic tapes are used for large computers such asmainframeComputers that store large amounts of data over a long period of time. In the PC you can also use tapes in the form of cassettes. The cost of storing data on tape is low. Tapes are made of magnetic materials that permanently store data. It can be 12.5mm to 25mm wide plastic sheet type and 500meters to 1200meters long coated with magnetic material. The deck is connected to the central processor and information is fed to or read from the tape via the processor. It resembles a cassette recorder.
Advantages of magnetic tape:
•Compact:A 10 inch diameter reel of tape is 2400 feet long and can hold 800, 1600 or 6250 characters in each inch of its length. The maximum capacity of such a tape is 180 million characters. As a result, data is stored on tape in a much more compact manner.
•Economically: The cost of storing characters is very low compared to other storage devices.
•Quickly: Copying data is easier and faster.
•Long-term storage and reusability: Magnetic tapes can be used for long-term storage and a tape can be used repeatedly without data loss.
magnetic plate:You may have seen the vinyl record, which is circular like a disc and coated with magnetic material. Magnetic disks used in computers are made on the same principle. It spins at very high speed in the computer drive. Data is stored both on the surface of the hard drive. Magnetic plates are most popular fordirect accessstorage medium.
Each disc consists of a series of invisible onesconcentric circlescalledSense. Information is recorded on tracks on a disk surface in the form of tiny magnetic spots. Represents the presence of a magnetic spota little bitand its absence represents a zero bit. The information stored on a floppy disk can be read many times without affecting the stored data. The reading process is therefore non-destructive. However, if you want to write new data, the existing data will be erased from the hard drive and new data will be recorded.
optical disc: Information is written on or read from an optical disk or tape using a laser beam. Optical disks are not suitable storage devices because their access time is longer than that of hard disks. Their advantage is that they have a very high storage capacity.
Types of optical storage are: CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-R and DVD-RW. Information on a CD-ROM is written at the time of manufacture. 700MB CD-R/W are available. A DVD-ROM is similar to a CD-ROM. It uses a shorter wavelength of laser beam and therefore stores more data than a CD-ROM.
With every new application and software, the need for storage capacity increases. It is the need to store large amounts of data that has led to the development of optical disk storage media. Optical discs can be divided into the following categories:
1.CD/read-only memory(CD-ROM): CD-ROMs are made of reflective metals. CD-ROM is written at high power during the manufacturing processLaser beam.Here the storage density is very high, the storage costs are very low and the access time is relatively fast. Each hard drive is approximately 4 1/2 inches in diameter and can hold over 600MB of data. How the CD-ROM can beread-onlyWe cannot write or change the data contained therein.
2.Write Once Read Many (WORM): The inconvenience that we cannot write anything on a CD-ROM is avoided in WORM. A WORM allows the user to permanently write data to the hard drive. Once the data is written, it can never be erased without physically damaging the hard drive. Data from the keyboard, video scanner,OCRequipment and other devices. The advantage of WORM is that it can store huge amounts of data in gigabytes (109 bytes). Each document in a WORM can be accessed very quickly, say less than 30 seconds.
3.Erasable optical disc: These are optical discs on which data can be written, erased and rewritten. This also applies a laser beam to write and rewrite the data. These panels can be used as an alternative to traditional panels. Erasable optical disks are based on a technology known asmagnetic optical(MO). To write a bit of data onto the erasable optical disc, the MO drive's laser beam heats and magnetizes a tiny, well-defined spot on the disc's surface.
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What is storage device and its classification? ›
Or in other words, we can say that a storage device is hardware that is used for storing, porting, or extracting data files. It can also store information/data both temporarily and permanently. Computer storage is of two types: Primary Storage Devices: It is also known as internal memory and main memory.What are the 4 types of storage devices? ›
- Primary storage devices.
- Magnetic storage devices.
- Flash memory devices.
- Optical storage devices.
- Cloud and virtual storage.
A storage device is available in various form factors; for case, a computer device includes different storage media such as hard disk, RAM, cache. They also have optical disk drives and externally connected USB drives. Two types of storage devices, primary and secondary are available there to store data.What are the three classification of storage? ›
There are three main categories of storage devices: optical, magnetic and semiconductor. The earliest of these was the magnetic device. Computer systems began with magnetic storage in the form of tapes (yes, just like a cassette or video tape). These graduated to the hard disk drive and then to a floppy disk.What are storage devices short notes? ›
Computer Storage Device Definition: A hardware device which can be used to store digital data and applications which may be in the form of images, video, audio, etc. is called a storage device. It is a key component of a computer and the hard drive is one of its examples.What are the five methods of storage? ›
There are five methods of storing vegetables and fruit: drying, canning, curing and salting, freezing and common storage. Which method is chosen depends upon the type of produce, the quality desired and the facilities available for storage. Regardless of the method chosen, some general rules should be followed: 1.What are the two main classifications of storage? ›
The two main types of primary storage are ROM, which is non-volatile , and RAM, which is volatile . Non-volatile memory keeps its contents even when the computer is switched off. Volatile memory loses its contents when power is lost.What are the different types of storage and their characteristics? ›
The main categories of storage devices are RAM, ROM, cache, magnetic, optical, cloud, and solid-state storage methods. Primary storage, they are volatile while secondary stores data permanently. The table below shows the most common unit to measure storage memory.What are different storage methods? ›
Internal file storage: Store app-private files on the device file system. External file storage: Store files on the shared external file system. This is usually for shared user files, such as photos. Shared preferences: Store private primitive data in key-value pairs.How many different categories of data storages are there? ›
There are two main types of digital data storage: Direct-attached storage and network-based storage.
What are some examples of data storage classifications? ›
- Highly Sensitive.
- Function Sensitive.
- Business Critical.
- Business Sensitive.
Storage devices are available in different forms, depending on the type of underlying device. For example, a standard computer has multiple storage devices including RAM, a cache, and a hard disk. The same device may also have optical disk drives and externally connected USB drives.What is the function of storage devices in computer? ›
A storage device, also known as storage, storage media, storage device, or file systems, may temporarily or permanently capture data such as photos, video, and audio. It is typically used to store, transfer, and extract data files.Which is the most common method of storage? ›
Refrigerated storage or low-temperature storage is the most common method of storing both fruits and vegetables worldwide.What are the different types of storage give examples? ›
- SSD and flash storage. Flash storage is a solid-state technology that uses flash memory chips for writing and storing data. ...
- Hybrid storage. ...
- Cloud storage. ...
- Hybrid cloud storage. ...
- Backup software and appliances.
cost per storage unit (i.e. price per gigabyte or megabyte) durability (toughness)What is device classification? ›
Classification of Medical Devices
The FDA categorizes medical devices into one of three classes – Class I, II, or III – based on their risks and the regulatory controls necessary to provide a reasonable assurance of safety and effectiveness.
What Does Storage Device Mean? A storage device is any type of computing hardware that is used for storing, porting or extracting data files and objects. Storage devices can hold and store information both temporarily and permanently. They may be internal or external to a computer, server or computing device.How do we classify devices used in computer? ›
- Input devices: For raw data input.
- Processing devices: To process raw data instructions into information.
- Output devices: To disseminate data and information.
- Storage devices: For data and information retention.
The classification of systems is used to scientifically name organisms based on genus and species. For instance, the scientific name for humans is Homo sapiens sapiens. “Homo” coming from the genus and “sapiens sapiens” being the species. All organisms can be classified based on the classification system.
What is classification and how is it used? ›
What Is Classification? Classification is the operation of separating various entities into several classes. These classes can be defined by business rules, class boundaries, or some mathematical function.What is storage device give examples? ›
Examples are Hard drives, USB flash drives, DC-RW, and DVD-RAM drives. ... A storage device that uses laser beams to read the information stored on the reflective surface of a disc. Popular types of optical storage devices are CD-ROM and DVD-ROM drives.What is the importance of storage devices in computer? ›
Storage devices are also known as secondary storage or external storage. It allows information to be saved or stored permanently after the computer has been turned off. A storage medium (plural is media) is the physical materials on which data, information and instructions are kept.