Floppy Disk Drive Lesson 5 CES Industries Inc

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 1 s and 0 s § 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 d. Word § kilo (103) = 1, 024 bytes (1 KB) § mega (106) = 1, 024, 000 bytes (MB) § giga (109) = 1, 024, 000 bytes (GB) CES Industries, Inc.

Floppy disks § Kilobyte (1 024 bytes) ü 1 Kilobyte: A very short story or about 1000 characters ü 2 Kilobytes: A Typewritten page or about 2000 characters ü 10 Kilobytes: An encyclopedia page OR A deck of punched cards ü 50 Kilobytes: A compressed document image page ü 100 Kilobytes: A low-resolution photograph ü 200 Kilobytes: An average world wide web page ü 500 Kilobytes: A medium resolution digital photograph ü 1000 Kilobytes: A small program CES Industries, Inc.

Floppy disks § Megabyte (1 000 bytes) ü 1 Megabyte: A small novel OR A 3. 5 inch floppy disk ü 2 Megabytes: A high resolution photo ü 5 Megabytes: The complete works of Shakespeare OR 3 seconds of TV-quality video ü 10 Megabytes: A minute of high-fidelity sound OR A digital chest X-ray ü 20 Megabytes: A box of floppy disks ü 50 Megabytes: A digital mammogram ü 100 Megabytes: 1 meter of shelved books OR A two-volume encyclopedia book ü 200 Megabytes: A reel of 9 -track tape OR An IBM 3480 cartridge tape ü 500 Megabytes: A CD-ROM OR The hard disk of a PC CES Industries, Inc.

Floppy disks § Gigabyte (1 000 000 bytes) ü 1 Gigabyte: A pickup truck filled with paper OR A symphony in highfidelity sound OR A 20 minute TV quality movie. ü 2 Gigabytes: 20 meters of shelved ~s OR A stack of 9 -track tapes ü 5 Gigabytes: An 8 mm Exabyte tape ü 20 Gigabytes: A good collection of the works of Beethoven OR 5 Exabyte tapes OR A VHS tape used for digital data ü 50 Gigabytes: A floor of books OR Hundreds of 9 -track tapes ü 100 Gigabytes: A floor of academic journals OR A large 10 -1 digital tape ü 200 Gigabytes: 50 Exabyte tapes CES Industries, Inc.

Floppy disks § Terabyte (1 (XX) 000 000 bytes) ü 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 ü 2 Terabytes: An academic research library OR A cabinet full of Exabyte tapes ü 10 Terabytes: The printed collection of the US Library of Congress ü 50 Terabytes: The contents of a large Mass Storage System CES Industries, Inc.

Floppy disks § Petabyte (1 000 000 000 bytes) ü 1 Petabyte: Collection of all the world wide web pages and their graphics. ü 2 Petabytes: The contents of all the US academic research libraries ü 20 Petabytes: Production of hard-disk drives in 1995 ü 200 Petabytes: All printed material OR Production of digital magnetic tape in 1995 § Exabyte (1 000 000 000 bytes) ü 5 Exabytes All words ever spoken by human beings. CES Industries, Inc.

Floppy disks § Zettabyte (1 000000000 bytes) § Yottabyte (1 000000 000 bytes) CES Industries, Inc.

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

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. CES Industries, Inc.

Floppy disks § Write Protect System Write Protect Notch Write Protect Switch 3 ½-inch CES Industries, Inc. 5 ¼-inch - 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