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Secondary Secondary Storage Storage Devices Devices

Secondary StorageSecondary Storage Secondary storage (or external Secondary storage (or external

memory) - memory) - is not directly accessible is not directly accessible by the CPU. Secondary storage does by the CPU. Secondary storage does not loose the data when the device is not loose the data when the device is powered down and is typically less powered down and is typically less expensive than primary storage. Data expensive than primary storage. Data is kept for a longer time in secondary is kept for a longer time in secondary storage.storage.

Types of Secondary StoragesTypes of Secondary Storages Magnetic Tape Magnetic Tape Hard Disk Hard Disk Floppy DiskFloppy Disk Optical Disk Optical Disk CDs (Compact Disks)CDs (Compact Disks) DVDs (DVDs (Digital Versatile DiscDigital Versatile Disc or  or Digital Digital Video Disc)Video Disc)

Magnetic TapeMagnetic Tape Magnetic Tape Magnetic Tape – is used for – is used for

storing large amount of data storing large amount of data and it is cheap. It comes in the and it is cheap. It comes in the form of a reel or cartridge and form of a reel or cartridge and is made of plastic that is coated is made of plastic that is coated with a metal oxide.with a metal oxide.

Hard DiskHard Disk A hard disk A hard disk is part of a unit, is part of a unit,

often called a "disk drive," that often called a "disk drive," that stores and provides relatively stores and provides relatively quick access to large amounts of quick access to large amounts of data. Computers typically come data. Computers typically come with a hard disk that contains with a hard disk that contains gigabytes of s of storage

Floppy DiskFloppy Disk Floppy Disk – Floppy Disk – (or diskette) is a (or diskette) is a

removable disk that everyone is removable disk that everyone is familiar with. Since it has a small familiar with. Since it has a small capacity, it is typically used to store capacity, it is typically used to store documents so that they can be used documents so that they can be used on more than one computer. on more than one computer.

Optical Disk Optical Disk Optical Disks Optical Disks are read using laser are read using laser

beams and stores data in tracks. beams and stores data in tracks. Optical discs are most commonly Optical discs are most commonly used for storing music (e.g. for use in used for storing music (e.g. for use in a a CD player), video (e.g. for use in a ), video (e.g. for use in a DVD player), or data and programs ), or data and programs for for personal computers

CDs (Compact Disks)CDs (Compact Disks)

CDsCDs - is an  - is an optical disc used to store  used to store digital data. It was originally . It was originally developed to store sound recordings developed to store sound recordings only, but later it also allowed the only, but later it also allowed the protection of other types of dataprotection of other types of data..

DVDs (Digital Versatile DVDs (Digital Versatile Disc or Digital Video Disc)Disc or Digital Video Disc)

DVDDVD, is an , is an optical disc  storage media  media format, and was invented in format, and was invented in 1995. Its . Its main uses are video and data storage. main uses are video and data storage. DVDs are of the same dimensions as DVDs are of the same dimensions as compact discs (CDs), but store more compact discs (CDs), but store more than six times as much data. than six times as much data.

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