Floppy Disk Drive Lesson 5 CES Industries, Inc.. 1. Evolved from audio tape to floppy disk drives, with the first being an 8” disk to modern 3 1/2” 2

Floppy Disk DriveFloppy Disk Drive

Lesson 5

CESCES Industries, Inc.Industries, Inc.


1.1. Evolved from audio tape to floppy disk drives, with the first Evolved from audio tape to floppy disk drives, with the first being an 8” disk to modern 3 1/2”being an 8” disk to modern 3 1/2”

2.2. Computers communicate and store information through the use Computers communicate and store information through the use

of binary numbers, or 1s and 0sof binary numbers, or 1s and 0s

Floppy disksFloppy disks

Each binary 1 and 0 represents a single binary digit or bit

4 bits is a nibble

8 bits is a byte

16 bits is a word

32 bits is a dWord

kilo (103) = 1,024 bytes (1 KB)

mega (106) = 1,024,000 bytes (MB)

giga (109) = 1,024,000,000 bytes (GB)



Kilobyte (1 024 bytes)

1 Kilobyte: A very short story or about 1000 characters 2 Kilobytes: A Typewritten page or about 2000 characters 10 Kilobytes: An encyclopedia page OR A deck of punched cards 50 Kilobytes: A compressed document image page 100 Kilobytes: A low-resolution photograph 200 Kilobytes: An average world wide web page 500 Kilobytes: A medium resolution digital photograph 1000 Kilobytes: A small program


Megabyte (1 000 000 bytes)

1 Megabyte: A small novel OR A 3.5 inch floppy disk 2 Megabytes: A high resolution photo 5 Megabytes: The complete works of Shakespeare OR 3 seconds of

TV-quality video 10 Megabytes: A minute of high-fidelity sound OR A digital chest X-ray 20 Megabytes: A box of floppy disks 50 Megabytes: A digital mammogram 100 Megabytes: 1 meter of shelved books OR A two-volume encyclopedia book 200 Megabytes: A reel of 9-track tape OR An IBM 3480 cartridge tape 500 Megabytes: A CD-ROM OR The hard disk of a PC



Floppy disksFloppy disks Gigabyte (1 000 000 000 bytes)

1 Gigabyte: A pickup truck filled with paper OR A symphony in high-fidelity sound OR A 20 minute TV quality movie.

2 Gigabytes: 20 meters of shelved ~s OR A stack of 9-track tapes 5 Gigabytes: An 8mm Exabyte tape 20 Gigabytes: A good collection of the works of Beethoven OR 5

Exabyte tapes OR A VHS tape used for digital data 50 Gigabytes: A floor of books OR Hundreds of 9-track tapes 100 Gigabytes: A floor of academic journals OR A large 10-1 digital

tape 200 Gigabytes: 50 Exabyte tapes


Floppy disksFloppy disks Terabyte (1 (XX) 000 000 000 bytes)

1 Terabyte: An automated tape robot OR All the X-ray files in a large technological hospital OR 50000 trees made into paper and

printed 2 Terabytes: An academic research library OR A cabinet full of

Exabyte tapes 10 Terabytes: The printed collection of the US Library of Congress 50 Terabytes: The contents of a large Mass Storage System


Petabyte (1 000 000 000 000 000 bytes)

1 Petabyte: Collection of all the world wide web pages and their graphics.

2 Petabytes: The contents of all the US academic research libraries 20 Petabytes: Production of hard-disk drives in 1995 200 Petabytes: All printed material OR Production of digital magnetic

tape in 1995

Exabyte (1 000 000 000 000 000 000 bytes)

5 Exabytes All words ever spoken by human beings.



Zettabyte (1 000000000 000 000000000 bytes)

Yottabyte (1 000000 000 000 000 000 000 000 bytes)



3.3. Information is stored Information is stored on the floppy disk as on the floppy disk as magnetic variations.magnetic variations.



Disk drive hub - mechanical mount that allows the disk to be turned.

Drive motor - turns the disk at a fixed rotational sped of 300 Revolutions per Minute to find information.

Read-write head - detects and produces the small magnetic signals that correspond to the information you are reading or writing onto the disk. The head is driven forward and back by a stepper-motor.


4.4. Parts of a 3 ½” floppy disk drive Parts of a 3 ½” floppy disk drive


Write Protect System - a light beam is projected through a small hole cut into the plastic case of the disk. No light - can write Light - can’t write


Write Protect Switch

Write Protect Notch

3 ½-inch 5 ¼-inch

Documents

Floppy Disk Drive Lesson 5 CES Industries, Inc.. 1. Evolved from audio tape to floppy disk drives, with the first being an 8” disk to modern 3 1/2” 2