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. Computers communicate and store information through the use of binary numbers, or 1s and 0s Floppy 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 (10 3 ) = 1,024 bytes (1 KB)  mega (10 6 ) = 1,024,000 bytes (MB)  giga (10 9 ) = 1,024,000,000 bytes (GB)

CES Industries, Inc. 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

CES Industries, Inc.  Megabyte ( 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

CES Industries, Inc. Floppy disks  Gigabyte ( 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

CES Industries, Inc. Floppy disks  Terabyte (1 (XX) bytes) 1 Terabyte: An automated tape robot OR All the X-ray files in a large technological hospital OR 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

CES Industries, Inc.  Petabyte ( 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 Petabytes: All printed material OR Production of digital magnetic tape in 1995  Exabyte ( bytes) 5 Exabytes All words ever spoken by human beings. Floppy disks

CES Industries, Inc.  Zettabyte ( bytes)  Yottabyte ( bytes) Floppy disks

CES Industries, Inc. 3. Information is stored on the floppy disk as magnetic variations. Floppy disks

CES Industries, Inc.  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. Floppy disks 4. Parts of a 3 ½” floppy disk drive

CES Industries, Inc.  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 Floppy disks Write Protect Switch Write Protect Notch 3 ½-inch5 ¼-inch