NAME: ALIZA AMAN

ROLL NO: 14B-103-BS

Usman Institte Of Technlogy, Khi Pakistan

NON-VOLATILE MEMORY

SECONDARY STORAGE DEVICES

Definition:A secondary storage device refers to any volatile storage device that is internal or external to the computer. It can be any storage device beyond the primary storage that enables permanent data storage. A secondary storage device is also known as an auxiliary storage device or external storage

TYPES OF SECONDARY AND NON-VOLATILE STORAGE

Types Of Secondary Devices Magnetic Tapes

Magnetic tape is a medium for magnetic recording, made of a thin magnetizable coating on a long, narrow strip of

plastic film.

Floppy DiskA floppy disk, also called a

diskette, is a disk storage medium composed of a disk of thin and flexible magnetic storage medium, sealed in a rectangular plastic carrier lined with fabric that removes dust particles.

DVD (Digital Versatile Disk Player)

DVD (sometimes explained as "digital video disc" or "digital versatile disc") is a digital optical disc storage format, invented and developed by Philips, Sony and Panasonic in 1995. DVDs can be played in multiple types of players, including DVD players.

• USB (Universal Serial Bus)

Universal Serial Bus (USB) is an industry standard developed in the mid-1990s that defines the cables, connectors and communications protocols used in a bus for connection, communication, and power supply between computers and electronic devices.

Definition:Nonvolatile Memory Is A General Term For All Forms Of Solid State (No Moving Parts) Memory. This Includes All Forms Of Read-only Memory (ROM) Such As Programmable Read-only Memory (PROM), Erasable Programmable Read-only Memory (EPROM), Electrically Erasable Programmable Read-only Memory (EEPROM), And Flash Memory.

EXPLAINATION : Non-volatile data storage can be categorized in electrically addressed systems (read-only memory) and mechanically addressed systems (hard disks, optical disc,magnetic tape,holographic memory, and such). Electrically addressed systems are expensive, but fast, whereas mechanically addressed systems have a low price per bit, but are slow. Non-volatile memory may one day eliminate the need for comparatively slow forms of secondary storage systems, which include hard disks.

Is computer memory that can retain the stored information even when not powered. Examples of

non-volatile memory include read-only memory, flash memory, most types of magnetic computer

storage devices (e.g. hard disks, floppy disk drives, and magnetic tape), optical disc drives, and

early computer storage methods such as paper tape and punch cards.

'''Volatile memory''', also known as '''volatile storage or primary storage device''', is computer memory that requires power to maintain the stored information, unlike non-volatile memory which does not require a maintained power supply.

Most forms of modern random access memory are volatile storage, including dynamic random access memory and static random access memory. Content addressable memory and dual-ported RAM are usually implemented using volatile storage. Early volatile storage technologies include delay line memory.

Secondary storage devices, as indicated by the name, save data after it has been saved by the primary storage device,

usually referred to as RAM. From the moment you start typing a letter in Microsoft Word, for example, and until you click on "Save," your entire work is stored in RAM. However,

once you power off your machine, that work is completely erased, and the only copy remaining is on the secondary

storage device where you saved it, such as internal or external hard disk drive, optical drives for CDs or DVDs, or USB flash

drive.

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Presented by Aliza AmanArain