Computer Storage System
Computer data storage, often called storage or memory is any hardware capable of store information permanently.
Examples of computer storage
1) Hard Drives
Hard disk is also called as “disk drive,” “hard drive,” or “hard disk drive (HDD)” that stores and provides relatively quick access to large amounts of data. Hard drives are magnetic storage devices that contain several discs inside called “Platters” that are attached to a spindle motor. The number of platters varies depending on the capacity of the drive.Now a day computers typically come with a hard disk that contains several billion bytes (gigabytes or terabytes) of storage.
A hard disk/drive comes with rotating speed varying from 4500 to 7200 rpm higher the rotating speed height the accessing speed of hard disk and higher the price.
Hard drive performance is measured as follows :
Access Time :
This is a measure of the average time that it takes the drives R/W heads to access data on the drive.
Seek Time :
This is the amount of time it takes for the drives head to move between cylinders and land on a particular track.
Data Transfer Rate :
The megabytes per second(MBps) in which data is transferred between the drive and the system.
2) Solid State Drives (SSD)
Solid state storage devices is an example of permanent storage device. It does not have moving mechanical components and it is very light weight. SSDs have very quick access time and lower latency also it is costly compare to hard disk of same volume.
3) Optical Disk Storage
It is permanent storage device that is it store data permanently and its data is read by a laser.
Mainly there are three types
a) compact disk (CD)
b) digital versatile disk (DVD)
c) Blu-Ray disk (BD).
a) Compact Disc (CD)
A compact disc is a storage unit which can store audio, video and other data in digital form , we can play the video or audio from CD stored data.
A standard compact disc measures 4.7 inches, and has a capacity of 80 minutes of audio, or 650 megabytes (MB) to 700 MB of data.CD used lasers lights for reading and writing data.
b) DVD (digital video disk)
DVD can store upto 4.7 gigabyte storage capacity on a single-sided, one-layered disk, has a capacity of a 133-minute movie. It can be single- or double-sided, and can have two layers on each side; a double-sided, two-layered DVD will hold up to 17 gigabytes of video, audio, or other information.
Blu-ray is an optical disc which is used for display high definition video it is used to store large amounts of data.It can store a 27 gigabyte (GB) single-sided discs where else 50 GB on dual-layer discs. Single-sided Blu-ray discs can store data of 13 hours of standard video data where else single-sided DVD’s can store data of 133 minutes.
4) Flash memory devices
Flash memory cards were used as a storage media for digital cameras and mobile computers. It consist of a small plastic package with a contact array that slots into a camera or other mobile computing device, or an appropriate memory card reader. It used to connected via a USB port as an external hardware unit.Its capacity varies from 8MB to 64GB.
There are also six major card formats, each with its own type of card slot. The most common format is the secure digital or SD card. Next are compact flash (CF) cards, the multi-media card (MMC) and the xD picture card (XD card).
5) Online and cloud
Storing data online and in cloud storage is becoming popular as people need to access their data from more than one device.
NAS stand for Network Access Server or Network-Attached Storage.It is a storage device that is connected to a network and provides a network with additional storage. A NAS does not have any processing power, that is, it cannot be used to execute or run any network programs.
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