Secondary StorageV2

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Secondary Storage


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Store most of the information the computeruses

Locate outside the primary storage area

Secondary Storage


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Non-volatile

Retains data even when the computer isturned off

Used for relatively long term storage ofdata out side the CPU

Secondary Storage


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Magnetic disk

Optical diskMagnetic tapes

Secondary Storage

The most important


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Flash drive, pen drives or thumb drives Zip drives

Made up of semiconductors

Secondary Storage

Removable storage devices have becomepopular nowadays


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The most widely used media

two kinds

floppy disks

Hard disks

Secondary Storage

Magnetic disk


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Permit direct access to data

The order, the data were originallyrecorded, is unimportant

Useful for systems required rapid and

direct access to data

Secondary Storage

Magnetic disk


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Secondary Storage

Disk drive


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The device in which the disk is maderotating

Reads data from or writes them onto thedisk

Reading or writing is done via read/writeheads

Secondary Storage

Disk drive


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Heads are fixed to the drive as to touchthe disk surface

The head moves back and forth along its

arm while the disk rotates

Secondary Storage

Disk drive


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So that the heads touches each point onthe disk surfaces

Hard disks are permanently fixed to the

disk drive Floppy disks are able to remove from and

insert into its drive

Secondary Storage

Disk drive


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The main secondary storage device of a

computer system.

Available in 20 GB, 40 GB, 80 GB, 110GB, and even more capacities.

Secondary Storage

Hard disk


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Composed of a pack of disks mounted on

to the disk drive.

There is one read write head per eachsurface.

Secondary Storage

Hard disk


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Secondary Storage

Floppy Disk


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Can be insert into and remove from its

drive whenever needed

Secondary Storage

Floppy Disk


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Can be used For transferring data from computer to

computer.

As a backup media.

Secondary Storage

Floppy Disk


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The size of todays most popular type.

Length and width (both) = 3.5 inch

Capacity = 1.44 MB

Not reliable and easily damageable.

Secondary Storage

Floppy Disk


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Used in desktop and laptop computers.

Storage capacity and the access rates are

lower than hard disks.

Secondary Storage

Floppy Disk


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The flash drive is removable and portable.

Secondary Storage

Flash drive


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Secondary Storage

The drive and thestorage device bothare compactly built

into a single smallunit.

Available in 128 MB,256 MB, 512 MB,1GB and even more.

Flash drive


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Secondary Storage

Storage capacity,reliability and the

access speed arerelatively larger thanthe floppy diskettes.

Has become popularover floppy diskettesas a portable backupdevice.

Flash drive


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An older storage technology.

Still employed for secondary storage oflarge quantities of data, needed rapidly but

not instantly.

Secondary Storage

Magnetic taps


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Magnetic tape real

Magnetic tape cartridge


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Relatively very inexpensive and stable.

Stores data sequentially.

Relatively very slow compared to othersecondary storage media.

Secondary Storage

Magnetic taps


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Sequential access media.

It cannot jump to any position on the tapefor direct reading.

The tape must be read from the beginning

up to the location of the desired record.

Secondary Storage

Magnetic taps


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Made of plastic and coated one side with amagnetic sensitive material.

Standard width is inch.

Secondary Storage

Magnetic taps


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Normally comes in reels of 2400 feet.

Tape cartridges like the cassette tapesand videotapes are also available.

Secondary Storage

Magnetic taps


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8 bits = 1 byte

10024 bytes = 1 kilo byte (KB)

10024 KB = 1 mega byte (MB)

10024 MB = 1 Giga byte (GB)

10024 GB = 1 Tera byte (TB)

Secondary Storage

Storage measuring units


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Also called compact disks.

Store massive quantities of data in ahighly compact form.

Secondary Storage

Optical Disk


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. Available for both PCs and large computers.

CD-ROM (compact disk read only memory)

CD-ROM is the most common optical disk

system used with PCs.

Secondary Storage

Optical Disk


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A 4.75-inch compact disk for PCs can store upto 700 MBs of data.

Nearly 500 times more than the capacity of ahigh-density floppy diskette.

Secondary Storage

Optical Disk


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Appropriate for applications where

enormous quantities of unchanging datamust be stored compactly for easyretrieval.

Secondary Storage

Optical Disk


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They are also suitable for applications

combining text, sound, and image.

Secondary Storage

Optical Disk

S S


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CD-ROM is a read only storage. No new

data can be written to it.

Some optical disk systems allow users to

record data only once on an optical disk.

Secondary Storage

Optical Disk

S d S


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Once written, the data cannot be erased

but can be read indefinitely.

Secondary Storage

Optical Disk

S d S


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CD-RW (CD-ReWriteble) technology has beendeveloped.

Allow users to create re writable optical disks forapplications requiring large volumes of storagewhere the information is occasionally updated.

Secondary Storage

Optical Disk

S d S


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Digital video disks (DVDs), are optical

disks having the same size as CD-ROMsbut of even higher capacity.

Can hold a minimum of 4.7 gigabytes ofdata.

Secondary Storage

Optical Disk

S d St


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DVDs are enough to store full length, highquality motion pictures, movies andmultimedia applications.

Secondary Storage

Optical Disk

What are CD ROM, CD Writer, DVD Rom, and DVDWriter


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How to use secondary storage devicesproperly?

How do you identify what the drivers are inyour computer?

What do you know about externally fixabledrivers?

Secondary Storage


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Thank You

Secondary Storage

Date post:	07-Apr-2018
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Secondary StorageV2

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