storage devices and its types

Why Storage????
Non-Volatile
Faster
Simple, Portable, Easy
Memory Unlimited
Popularity
Cheaper than Primary Memory

1. PRESENTED BY:
Sabin Kafle

2. Why secondary storage?

3. Non-Volatile
Faster
Simple, Portable, Easy
Memory Unlimited
Popularity
Cheaper than Primary Memory
Points to Remember

4. Storage Devices
 Disk types
•Floppy disks
•Hard disks
•Magnetic Tape
•Zip disks
•Flash drive
•Optical disks ( CD-ROM, CD, DVD, RW)

5. Magnetic Storage Devices
Floppy Disk
low capacity only 1.44 Mb
Zip as ‘Super floppies’ 100 Mb
Read-write
Small, light, portable
Outdated

6. Magnetic Sorage Device
Hard Disk
Non-Volatile
Faster than floppy
Higher capacity terms of GB.
Non-removable, Removable, most common.
R-W drive
1
st
introduced in IBM PC
Coated with magnetic material
Expensive one

7. Magnetic Storage Device
Magnetic tape
Ribbon of plastic material
Magnetic recording
Analogue data
RW and Durable
Capacity depends upon length and size
Not suitable for data files

8. Storage Device
Optical disks

CD-ROM
Non-Volatile
Digital optical device
laser technology, extremely fast
Typical capacity of 700 Mb
Store any type of data
Being replaced
Diameter of 120mm
Thickness of 1.2mm
Low quality playback than DVDs

9. Storage Devices
Compact Disc-Recordable
Write Once Read Many
Made of polycarbonate
Retains a high level of compatibility
Cheaper form
Read using Laser light
CD-R
Optical disk

10. Optical Storage Device

CD-RW
Rewritable optical disc
Require a more sensitive laser optics
Hardware with RW is required
Re-Written up to 10,000 times

11. Recordable optical disc
Cheaper
Records multi-formats
Capacity of 4.7GB
 Non-Volatile data storage
Optical Storage Device
DVD-R

12. Optical Storage Device
DVD-RW
Rewritable optical disk
Typically 4.7GB
Hardware capability required
Widely used
Diameter of 8 cm

13. Electronic Storage Device
Flash memory
Opto-Magnetic storage
EEPROM based technology
Data transfer
Portable, Easy, Simple
Higher speed
Multiple purpose