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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, …