Secondary storage devices are not directly accessible by the CPU and do not lose data when powered down. Common secondary storage devices include magnetic tapes for storing large amounts of data cheaply, hard disks for quick access to large amounts of gigabytes of storage, floppy disks for smaller storage and transport of documents between computers, and optical disks like CDs and DVDs which use lasers to store and access digital data for music, video, programs and more. DVDs specifically store over six times more data than CDs using the same physical dimensions through optical disc storage technology developed in 1995.

1. Please be Quiet

2. Secondary Storage Devices

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

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

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

6. Hard Disk A hard disk is part of a unit, often called a "disk drive," that stores and provides relatively quick access to large amounts of data. Computers typically come with a hard disk that contains gigabyte s of storage

7. Floppy Disk Floppy Disk – (or diskette) is a removable disk that everyone is familiar with. Since it has a small capacity, it is typically used to store documents so that they can be used on more than one computer.

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

9. CDs (Compact Disks) CDs - is an optical disc used to store digital data . It was originally developed to store sound recordings only, but later it also allowed the protection of other types of data .

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

16. SORRY That’s all folks