Storage

Computers Are Your Future

Week 5

Slide 2

Computers Are Your Future

Storage Devices

Slide 3

What You Will Learn About

How data is stored on both hard and floppy disks The various optical storage media available for personal

computers

Slide 4

Floppy and Zip Disks and Drives

A disk or diskette is a portable storage medium. High-density floppy disks that are commonly

used today store 1.44 MB of data for PC and 1.2 for Mac.

Disks work with a disk drive. Zip disks is a magnetic portable storage

medium store up to 750 MB of data and are not downwardly compatible with floppy disks.

Zip DriveFloppy Drive

Floppy Disk

Slide 5

Protecting the Data on Your Disks

Don’t touch the surface of the disk. Don’t expose disk to magnetic fields. Avoid contamination (food, drink). Avoid condensation. Avoid excessive temperatures.

Slide 6

Optical Storage Devices

Uses laser beams to read patterns (pits / land) of data encoded on the surface of plastic disc

Pit = 0 land = 1

Slide 7

CD Discs and Drives

CD-ROM stands for Compact Disc-Read Only Memory.

Data recorded on them are to be read many times but it be changed

CD-ROM drives can not write data to discs.

They are capable of storing 700 MB of data. How many Floppy disk?

They are used for storing operating systems, large application programs, and multimedia programs.

Slide 8

CD-R and CD-RW Discs and Recorders

CD-R

Discs can be read and written to.

Discs can only be written to “once.”

CD-R drives are capable of reading and writing data.

CD-RW

Discs can be read and written to.

Discs are erasable.

Discs can be written to many times.

CD-RW drives are capable of reading, writing, and erasing data.

Slide 9

DVD Discs and Drives

DVD stands for Digital Video Disc.

DVD technology is similar to CD-ROM technology.

DVDs are capable of storing up to 17GB of data.

The data transfer rate of DVD drives is comparable to that of hard disk drives.

Slide 10

DVD-RW and DVD+RW Discs

DVD-R and DVD+R drives have the ability to read/write data.

DVD-RW and DVD+RW drives allow you to write, erase, and read from a disc many times.

Slide 11

Protecting Data on Discs

Do not expose discs to excessive heat. Do not touch underside of discs. Do not write on the label side of discs with a

hard instrument. Do not stack discs. Store discs in original

boxes.

Slide 12

The Future of Storage

FMD-ROM• Fluorescent (very bright) multilayer disc-read-only memory.

• Each layer of the disc contains data.

• Layer is transparent enough for light to shine through.

• Laser can focus on one layer at a time.

• Allows for additional storage capability.

Slide 13

Solid State Storage Devices

Solid state storage devices use nonvolatile memory chips to retain data.

They do not have moving parts.

They are small, lightweight, reliable, and portable.

Slide 14

Compact Flash Memory

Flash Memory

Smart Card

Micro Drive

Memory Stick

PC Card

Solid State Storage Devices

Slide 15

Flash memory cards

Smart media cardsCompactFlash cardsUSB : Thumb drive / flash memory / jump drive / pen

drive / flash drive

Slide 16

Smart card

Is a credit card sized device that combines flash memory with a tiny microprocessor enabling the card to process as well as save information

Digital cash systemUser can purchase a prepaid amount of electronically

stored money. Used in many systems as parking, tools, transport fares, …