Storage Devices

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4. The bit is a basic unit of information. The words bit and binary digit are used interchangeably. The binary digit can have only one of two values. It may be physically represented with a two-state device.


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5. Blu-ray is a digital optical disc. It is capable of storing several hours of video in high-definition and ultra high-definition resolution. The name "Blu-ray" refers to the blue laser which is used to read the disc.


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6. Backup refers to the copying into an archive file of computer data so it may be used to restore the original after a data loss event. The main reason for data backup is to save important files if a system crash or hard drive failure occurs.


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7. A blue laser is a laser that emits electromagnetic radiation with a wavelength between 360 and 480 nanometers, which the human eye sees as blue or violet. Some of the most commercially common blue lasers are the diode lasers used in Blu-ray applications.


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8. A magnetic card is a type of card capable of storing data. The magnetic card sometimes called swipe card or magstripe. Magnetic cards are commonly used in credit cards, identity cards, and transportation tickets.


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9. Compact disc is a digital optical disc data storage device .It was co-developed by Philips and Sony and released in 1982.These have a diameter of 120 millimeters and can hold up to about 80 minutes of uncompressed audio or about 750 MB of data.


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10. A floppy disk is a type of disk storage composed of a disk of thin and flexible magnetic storage medium.3 1⁄2-inch floppy disk can store data up to 360 KB.8-inch floppy disk cab store data up to 2.88 MB.


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11. DVD is a digital optical disc storage device developed in 1995.The basic types of DVD are referred to by a rough approximation of their capacity in gigabytes.


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12. Bubble memory is a type of non-volatile computer memory that uses a thin film of a magnetic material to hold small magnetized areas. Bubble memory is largely the brainchild of a single person, Andrew Bobeck.


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13. A hard disk drive is an electromechanical data storage device that uses magnetic storage to store and retrieve digital information. HDDs are the dominant secondary storage device for general-purpose computers.


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14. Universal Disk Format (UDF) is a file system for computer data storage for a broad range of media. UDF is developed and maintained by the Optical Storage Technology Association (OSTA).


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15. Non-Volatile Memory Express, also known as NVMe, is a device technology introduced by Intel in 2007. It standardizes the way that non- volatile memory devices, such as SSDs, can be connected to a computer.


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16. The byte is a unit of digital information that most commonly consists of eight bits. The term byte was coined by Werner Buchholz in June 1956.The term octet is used to specify a size of eight bits.


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17. A SSD is a storage medium that uses non-volatile memory as a means of holding and accessing data.SSD has no moving parts which gives it advantages such as faster access time, noiseless operation, higher reliability, and lower power consumption.


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18. HVD stands for Holographic Versatile Disc. It has been development by The Holography System Development (HSD) Forum using a green writing/reading laser and a red positioning/addressing laser.


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19. A tape drive is a data storage device that reads and writes data on a magnetic tape. A tape drive provides sequential access storage. Tape drives can stream data very quickly off a tape.


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20. The term backing storage refers to non-volatile data storage. Common types of backing storage devices are hard drives, SSD, external hard disk drives, optical media such as CD or DVD, and flash media such as thumb drives and memory sticks.


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