FDD

1

HARDWARE WORHSHOP

• FDD
• Floppy Disk Drive

2
Introduction

• What is a floppy disk drive ..??
• A physical component of the computer which
  serves as a medium to read and write data to
  floppy disk
• Sneak peak at FDDs brief history
• Arrival in 1969(8 inches in diameter)
• Invented By IBM team led by David Noble
• Herald of 5 ¼ inch(1976) 3 ½ inch(1983) FDD
• Maximum capacity of 3½-inch FDD is LS(Laser
  Servo)-240(1997) having size of 240.75 MB

3
DRIVE COMPONENTS

• THE READ\WRITE HEAD
• THE HEAD ACTUATOR
• THE SPINDLE MOTOR
• CIRCUIT BOARDS

4
READ / WRITE HEADS

• The head mechanism is moved by a motor called
  head actuator
• The heads move in and out tangentially to the
  surface of the disk and record the tracks
• Both the upper and lower heads define tracks on
  their respective sides
• Floppy disks are recorded to a maximum of 80
  tracks on each side

5
HEAD ACTUATOR

• The head actuator consists of a motor called the
  stepper motor
• The stepper motor rotates in discrete steps
• Most stepper motors used in FDD's can step in
  specific increments that relate to track spacing
  on the disk
• The timing of one half or one third of a head
  actuator mechanism is often used to determine the
  average access time for a disk drive

6
THE SPINDLE MOTOR

• The spindle motor is what spins the disk
• Normal speed of rotation is 300 or 360
  rpm(depends on the type of the drive)
• 5 1/4 inch fdd -360 rpm
• All modern drives use a direct drive system with
  no belts

7

Top view of a FDD
8
Circuit Board

• Circuit boards contain circuitry used to control
  the head actuator, read- write heads, spindle
  motor, disk sensors and other drive components
• A disk drive always incorporates one or more
  logic boards
• The logic board implements the drives interface
  to the controller board in the system unit

9
TYPES OF FDD

• 1.44MB 3 ½ INCH FDD
• 2.88MB 3 ½ INCH FDD
• 720 KB 3 ½ INCH FDD
• 1.2 MB 5 ¼ INCH FDD
• 360 KB 5 ¼ INCH FDD

8 inch, 5 ¼ inch, and 3.5 inch drives
10
Some Examples
11
FLOPPY CONSTRUCTION
1. Write Protect Tab 2. Hub 3. Shutter 4. Plastic
Housing 5. Paper Ring 6. Magnetic disk 7. Disk
Sector
12
THANK YOU
13
Presented By

• Vishvendra Gupta
• Udit Chandraul
• Anurag Upadhyay
• Pankaj Kumar
• Suraj Savita
• Niraj Vishvakarma