Slide 1

TOPIC: PERIPHERIAL DEVICES

SUB TOPIC: STORAGE DEVICES & MODEMS

HARD DISK

Today, most people use Hard Disks for Secondary storage. The basic technology used in hard disks is similar to that of magnetic tape. Magnetic material is layered onto a high-precision aluminum disk. The disk head can move to any point on the platter almost instantly.Hard Disk

To increase capacity, a hard disk will usually contain several plattersHard Disk

The heads never touch the platters, but they are very close. This makes hard disks susceptible to mechanical shock.

Hard Disk

FLOPPY DISK

Floppy disks are similar to hard disksBecause the medium is floppy, the disks cannot operate at the same speeds as a hard disk.Floppy disks are older technology which havent received a lot of attention since the late 1980s.Their capacity is very less.Floppy Disk

The first floppy disks were 8 Inches in diameter The held about 256 K.The next generation were 5.25 inches in diameter.Could hold up to 1.44 MB. The next generation were 3.5 inches in diameter. These disks are held within a hard plastic case.

Floppy Disk

Floppy DiskMany computers today do not even come with floppy disk drives anymore.A spring loaded flap protects the disk from dust and greasy fingers.Could hold up to 2.88 MB.

MODEM

9B-11 Modem usesConnection to the InternetFile Transfer UploadingDownloading

11Teaching tipDraw a diagram showing the Internet above the client computer to illustrate where the names come from.

A modem (modulator-demodulator) is a network hardware device that modulates one or more carrier wave signals to encode digital information for transmission and demodulates signals to decode the transmitted information.

Modem

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