Slide 25
Chapter 3 Output: From Pulses to People
Rules of Thumb: Ergonomics and Health
Choose equipment that’s ergonomically designed Create a healthy workspace
Build flexibility into your work environment Rest your eyes
Stretch to loosen tight muscles Listen to your body
Seek help when you need it
Slide 26
Chapter 3 Storage Devices: Input Meets Output
Magnetic Tape
Can store large amounts of information in a small space at a relatively low cost
Limitation: sequential data access Used mainly for backup purposes
Slide 27
Chapter 3 Storage Devices: Input Meets Output
Magnetic Disks
Random data access Floppy disks
Provide inexpensive, portable storage
Hard disks
Non-removable, rigid disks that spin continuously and rapidly
Provide much faster access than a floppy disk
Removable media Zip Jaz disks
Provide high-capacity portable storage
Slide 28
Chapter 3 Storage Devices: Input Meets Output
Optical Disks
Use laser beams to read and write bits of information on the disk surface
Not as fast as magnetic hard disks Massive storage capacity
Very reliable
Slide 29
Chapter 3 Storage Devices: Input Meets Output
CD-ROM
Optical drives that read CD-ROMs
CD-R
WORM media write-once, read many
CD-RW
Can read CD-ROMs and write, erase and rewrite data onto CD-R CD-RW disks
Slide 30
Chapter 3 Storage Devices: Input Meets Output
DVD Digital Versatile Disks
Store distribute all kinds of data Hold between 3.8 and 17 gigabytes of information
DVD-ROM drives
Can play DVD movies, read DVD data disks, read standard CD-ROMs, and play audio CDs
Because they’re read-only, they can’t record data, music, or movies
DVD-RAM drives
Can read, erase, and write data but not DVD video on multi-gigabyte DVD-R but not CD-R or CD-RW media
Slide 31
Chapter 3 Storage Devices: Input Meets Output
Solid-State Storage Devices
Flash memory is an erasable memory chip
Sizes range from 16 MB to 1 GB Compact alternative to disk storage
Contains no moving parts Designed for specific applications such as
storing pictures in digital cameras Likely to replace disk and tape storage
Slide 32
Chapter 3 Computer Systems: The Sum of Its Parts
