tailieunhanh - Lecture Introduction to Computers: Chapter 6A - Peter Norton's

Chapter 6A - Types of storage devices. In addition to floppy disks and hard drives, today's computer user can choose from a wide range of storage devices, from “key ring" devices that store hundreds of megabytes to digital video discs, which make it easy to transfer several gigabytes of data. This lesson examines the primary types of storage found in today's personal computers. You'll learn how each type of storage device stores and manages data. | McGraw-Hill Technology Education Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved. Chapter 6A Types of Storage Devices Teaching tip A good warm-up to storage devices is to discuss the time before we could save items on disk. Discuss the perils of typing papers on a typewriter. Then contrast with the simplicity of saving to disk. Describing Storage Devices Store data when computer is off Two processes Writing data Reading data 6A- Describing Storage Devices Storage terms Media is the material storing data Storage devices manage the media Magnetic devices use a magnet Optical devices use lasers Solid-state devices have physical switches 6A- Magnetic Storage Devices Most common form of storage Hard drives, floppy drives, tape All magnetic drives work the same 6A- Teaching tip Figure and on page 227 provide illustrations of devices and the read/write process. Magnetic Storage Devices Floppy Disk Hard Disk Tape 6A- Magnetic Storage Devices Data storage and retrieval Media is covered with iron oxide Read/write head is a magnet Magnet writes charges on the media Positive charge is a 1 Negative charge is a 0 Magnet reads charges Drive converts charges into binary 6A- Teaching tip This process is difficult for students to see. Draw a diagram on the board that illustrates the process. Data Retrieval 6A- Magnetic Storage Devices Data organization Disks must be formatted before use Format draws tracks on the disk Tracks is divided into sectors Amount of data a drive can read 6A- Discussion point Discuss the sector size limitation. Discuss what can happen when writing a 1-byte file or a 513-byte file. After the waste issue is brought up, then discuss the problem from the hardware issue. How can a manufacturer make a 1-byte head? Tracks and Sectors 6A- Magnetic Storage Devices Finding data on disk Each track and sector is labeled Some are reserved Listing of where files are stored File Allocation Table (FAT) FAT32 | McGraw-Hill Technology Education Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved. Chapter 6A Types of Storage Devices Teaching tip A good warm-up to storage devices is to discuss the time before we could save items on disk. Discuss the perils of typing papers on a typewriter. Then contrast with the simplicity of saving to disk. Describing Storage Devices Store data when computer is off Two processes Writing data Reading data 6A- Describing Storage Devices Storage terms Media is the material storing data Storage devices manage the media Magnetic devices use a magnet Optical devices use lasers Solid-state devices have physical switches 6A- Magnetic Storage Devices Most common form of storage Hard drives, floppy drives, tape All magnetic drives work the same 6A- Teaching tip Figure and on page 227 provide illustrations of devices and the read/write process. Magnetic Storage Devices Floppy Disk Hard Disk Tape 6A- Magnetic Storage Devices .