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Floppy Disk Drive. Lesson 5. CES Industries, Inc. Floppy disks. 1. Evolved from audio tape to floppy disk drives, with the first being an 8” disk to modern 3 1/2” 2. Computers communicate and store information through the use of binary numbers, or 1s and 0s.
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Floppy Disk Drive Lesson 5 CESIndustries, Inc.
Floppy disks 1. Evolved from audio tape to floppy disk drives, with the first being an 8” disk to modern 3 1/2” 2. Computers communicate and store information through the use of binary numbers, or 1s and 0s • 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)
Floppy disks • 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
Floppy disks • 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 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 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
Floppy disks • 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.
Floppy disks • Zettabyte (1 000000000 000 000000000 bytes) • Yottabyte (1 000000 000 000 000 000 000 000 bytes)
Floppy disks 3. Information is stored on the floppy disk as magnetic variations.
Floppy disks 4. Parts of a 3 ½” floppy disk drive • 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.
Write Protect Notch Write Protect Switch 3 ½-inch 5 ¼-inch Floppy disks • 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