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SECONDARY STORAGE DEVICES
PRESENTED BYTHOUFEEK.A
S2 MBA
IMK ADOOR
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Why secondary storage device?
Limitations of primary storage
Volatile nature
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used in a computer to overcome the limitations ofprimary storage
Unlimited capacity
Storing data on permanent basis
Also known asAUXILIARY MEMORY
Secondary storage
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Secondary storage
Sequential access direct access
Magnetic tape
Magnetic disk optical disk memory storage
floppy hard disk cd-rom cd-r cd- rw flash mmcard
Zip disk disk pack Winchester disk
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Commonly used sequential access device
Plastic ribbon coated with magnetizable material
such as iron oxide or chromium dioxide
Cost is low
Tape can be erased and reused many times
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Easy to handle and store
Large storage capacity
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disadvantages
Not suitable for storage of those data whichare used frequently required to b accessed
randomly
Must be stored n a dust free environment
Tape ribbon may be twisted due to warping,resulting in loss of stored data
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Direct access devices
Devices where any storage location may
be selected and accessed at random.
Permits access to individual information in
a more direct or immediate manner.
Equal access time
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suitable for direct access application such
as online ticket booking system, online
banking system.
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MAGNETIC DISCS
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Commonly used direct access device
A thin circular Plate/platter made of metal
or plastic, usually coated on both side with
a magnetizable recording material such asiron oxide
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Types
1. Floppy Disk
2. Hard Disks
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Floppy Disk
Round flat piece of flexible plastic disk coated
with magnetic oxide
Most popular and inexpensive secondarystorage device
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Hard disks
Round flat piece of rigid metal disk coated with
magnetic oxide
Three types of hard disks
1. Zip disk
2. Disk pack
3. Winchester disk
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Zip disk
Used a single hard disk platter encased in
a plastic cartridge
Disk drive may be portable or fixed type
Fixed type is a part of computer system,permanently connected to it.
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Portable type can be carried to computer
system, connected to it for the duration of
use, and then can be disconnected andtaken away when the work is done.
Zip disk can be easily inserted and
removed through a zip drive.
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Zip disk
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Disk packs
Uses multiple hard disk platters mounted
on a single central shaft
Separate read / write head for each
usable disk surface
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Winchester disk
Uses multiple hard disk platters mounted
on a single central shaft
Hard disk platters and the disk drive are
sealed together in contaminator- freecontainer and cannot bee separated from
each other.
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Optical disks
Consist of circular disks, coated with a thin
metal or some other material that is highly
reflective.
Laser beam technology is used
Store large amount of data within a lmited
space.
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CD- ROM
Compact Disk Read Only Memory
Disk come pre recorded and the information
stored them cannot be altered.
Pre recorded by their suppliers, by a process
called mastering.
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CD- Recordable (CD- R)
Write once, read many.
Same as CD-ROM and has same storagecapacity.
Allow users to create their on CD-ROM
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CD-Read/Write (CD-RW)
Same as CD-R and same storage
capacity
Can be erased and written a fresh.
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Digital Video/versatile Disk
(DVD)Looks same as CD-ROM
But has capacity of 4.7 GB or 8.5 GB
Used for storage of large data
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Memory Storage Devices
Flash drive
New secondary storage device based on flash
memory.
Easy transport of data from one computer to another.
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Comes in various size and stylish designs
Plug and play device that simply plug into a USB
port of computer treated as removable drive.
Its known as pen drive.
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Memory card
Similar to flash drive but in card shape
Plug and play device that simply plug intoa computer port, treated as removable
drive
Useful in electronic devices like camera,
music system, mobile phones
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THANK YOU
