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Storage Devices
Presented by
NOOR ZULFIQAR
chemistnoor94@gmail.com
Storage devices and
mechanism of data storage
in audio and visual form
Types of storage devices:
• Magnetic storage devices:
• Floppy disc
• Hard disc
• Optical storage devices:
• CD (ROM)
• DVD
• Solid state storage devices:
• USB
• SD CARD
Presented by Noor Zulfiqar
Electronic machines process information in digital format.
Instead of understanding words and numbers, as people do, they
change those words and numbers into digital data, it has only
two states as 0 or 1.Basically it corresponds to either ON state
ie. 1 or OFF state ie. 0.
 "A" is stored as seven binary numbers: 1000001.
 A question mark (?) is stored as 111111
 A number 7 as 110111,
 and a left bracket ([) as 1011011
Binary Codes
Computers can’t be switched off entirely and hence
OFF stage is represented by a low voltage (0) and
ON stage is represented by a high voltage (1).
Presented by Noor Zulfiqar
Presented by Noor Zulfiqar 6
Magnetic Storage Devices
Magnetic Storage devices uses a magnetisable
material to store data........
Types:
1)Floppy Disc
2)Hard Disc
Mechanism of data storage in
Floppy disc
Presented by Noor Zulfiqar
Read /write Head
Presented by Noor Zulfiqar
Stepper Motor
Presented by Noor Zulfiqar
Spindle Motor
Hard Disc
Presented by Noor Zulfiqar
12
Presented by Noor Zulfiqar
Presented by Noor Zulfiqar
In optical storage devices an optical disk drive uses a
laser light to read data from or write data to an optical
disc.A laser in this context means an electromagnetic
wave with a very specific wavelength within or near the
visible light spectrum.For CDs, a wavelength of 780
(nm) is used, which is in the infrared range. For DVDs, a
wavelength of 650 nm (red) is used
Optical storage
devices
Two optical storage devices:
1)CD. 2)DVD Presented by Noor Zulfiqar
Mechanism of data storage in CD-ROM
Presented by Noor Zulfiqar
"digital versatile disc"
or
"digital video disc"
Presented by Noor Zulfiqar
The data on CDs and DVDs is recorded in a spiral that starts at
the center of the disc. DVDs hold more data because they have a
longer spiral on which to record data.
(CDs store 650-700 MB of data)
(DVDs store 4.7 Gb of data)
Difference between CD and
DVD
Presented by Noor Zulfiqar
Solid State Storage Devices
Solid State storage devices are based
on electronic circuits with no moving
parts(no real of tape, no spinning discs,
no laser beams, etc)
solid state devices store data using a
special type of memory called Flash memory
(A kind of memory that retains data
in the absence of power supply)
Types: 1)USB 2)SD card
Presented by Noor Zulfiqar
Mechanism of data
storage in SD card
Storage Devices and the Mechanism of Data Storage in Audio and Visual Form
Presented by Noor Zulfiqar
23
(USB)
Presented by Noor Zulfiqar
Presented by Noor Zulfiqar

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Storage Devices and the Mechanism of Data Storage in Audio and Visual Form

  • 2. Storage devices and mechanism of data storage in audio and visual form
  • 3. Types of storage devices: • Magnetic storage devices: • Floppy disc • Hard disc • Optical storage devices: • CD (ROM) • DVD • Solid state storage devices: • USB • SD CARD Presented by Noor Zulfiqar
  • 4. Electronic machines process information in digital format. Instead of understanding words and numbers, as people do, they change those words and numbers into digital data, it has only two states as 0 or 1.Basically it corresponds to either ON state ie. 1 or OFF state ie. 0.  "A" is stored as seven binary numbers: 1000001.  A question mark (?) is stored as 111111  A number 7 as 110111,  and a left bracket ([) as 1011011 Binary Codes
  • 5. Computers can’t be switched off entirely and hence OFF stage is represented by a low voltage (0) and ON stage is represented by a high voltage (1). Presented by Noor Zulfiqar
  • 6. Presented by Noor Zulfiqar 6 Magnetic Storage Devices Magnetic Storage devices uses a magnetisable material to store data........ Types: 1)Floppy Disc 2)Hard Disc
  • 7. Mechanism of data storage in Floppy disc Presented by Noor Zulfiqar
  • 8. Read /write Head Presented by Noor Zulfiqar
  • 11. Hard Disc Presented by Noor Zulfiqar
  • 13. Presented by Noor Zulfiqar
  • 14. In optical storage devices an optical disk drive uses a laser light to read data from or write data to an optical disc.A laser in this context means an electromagnetic wave with a very specific wavelength within or near the visible light spectrum.For CDs, a wavelength of 780 (nm) is used, which is in the infrared range. For DVDs, a wavelength of 650 nm (red) is used Optical storage devices Two optical storage devices: 1)CD. 2)DVD Presented by Noor Zulfiqar
  • 15. Mechanism of data storage in CD-ROM
  • 16. Presented by Noor Zulfiqar
  • 17. "digital versatile disc" or "digital video disc" Presented by Noor Zulfiqar
  • 18. The data on CDs and DVDs is recorded in a spiral that starts at the center of the disc. DVDs hold more data because they have a longer spiral on which to record data. (CDs store 650-700 MB of data) (DVDs store 4.7 Gb of data) Difference between CD and DVD Presented by Noor Zulfiqar
  • 19. Solid State Storage Devices Solid State storage devices are based on electronic circuits with no moving parts(no real of tape, no spinning discs, no laser beams, etc) solid state devices store data using a special type of memory called Flash memory (A kind of memory that retains data in the absence of power supply) Types: 1)USB 2)SD card Presented by Noor Zulfiqar
  • 22. Presented by Noor Zulfiqar
  • 23. 23
  • 25. Presented by Noor Zulfiqar