com.sys. mica

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By: Ms. Ivy Mica B. Lauresta BSEE-IV

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Page 1: Com.sys. Mica

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By: Ms. Ivy Mica B. Lauresta

BSEE-IV

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What is Peripheral Device?

is any input or output component that

connects to a computers system unit

 Any device connected internally or 

externally to a computer and used in the

transfer of data

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Hard Disk

-Is a non-volatile, random accessdevice for digital data

-A flat, circular plates made of aluminum or glass and coated with amagnetic materials

-Magnetic storage medium for amicrocomputer 

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Hard Disk Drive Management

Parameters

prlctl set <ID|VM_name> --device-add hdd [--image <name>]

[--type <expand|plain>][--size <number>][--split]

[--iface <ide|scsi>][--position <number>]

[--enable|--disable]

prlctl set <ID|VM_name> --device-add hdd --device <name>

[--iface <ide|scsi>][--position <number>]

[--enable|--disable]

prlctl set <ID|VM_name> --device-set hddN [--image <name>]

[--type <expand|plain>][--size <number>][--split]

[--iface <ide|scsi>][--position <number>]

[--enable|--disable]

prlctl set <ID|VM_name> --device-set hddN --device <name>

[--iface <ide|scsi>][--position <number>]

[--enable|--disable]

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Arrangement of Data

The arrangement of data with a redundantarray is accomplished with a processknown as disk striping. In layman¶s terms,the storage space on each drive is

sectioned or partitioned into a collection of sectors with the same storage capacity.When new data is entered and saved, thedata saves to the defined sectors on eachdrive involved with the storage strategy.This means that when data is saved on theprimary hard drive, it is simultaneouslysaved on each of the secondary drives.

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Optical Discs

-Is a flat, usually circular disc which

encodes binary data in the form of pits

(binary value of 0 or off, due to lack of 

reflection when read) and lands (binary

value of 1 or on, due to a reflection

when read) on a special material (often

aluminum)on one of its flat surfaces-Commonly used for storing music,

video, or data and programs for PC

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CD-DA(Compact Disc Digital Audio)

-an optical disc used to store digital data

-It was originally developed to store and

playback sound recordings exclusively

-The first CD format was of course thatwhich defined the audio CD used in all

regular CD players

Types of Optical Disc

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Diagram of CD Layers

 A. A polycarbonate disclayer has the dataencoded by using landsand pits.

B. A reflective layer reflects

the laser back. C. A lacquer layer is used

to prevent oxidation

D. Artwork is screenprinted on the top of thedisc.

E. A laser beam reads thepolycarbonate disc, isreflected back, and readby the player.

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Types of Optical Disc

CD-ROM (Compact Disc Read- OnlyMemory)

-are identical in appearance to audio

CDs and data are stored and retrieved in avery similar manner (only differing fromaudio CDs in the standards used to storethe data).

-Is a pre-pressed compact disc thatcontains data accessible to, but notwritable by a computer for data storageand music playback

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Types of Optical Disc

CD-RW (Compact Disc ReWritable)

- is a rewritable optical disc

- discs require a more sensitive laser 

optics

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Types of Optical Disc

DVD (Digital-Versatile Disc)

-is an optical disc storage mediaformat

-the same dimension as CD, but iscapable of storing almost seven timesas much data

- DVD is composed of several layersof plastic, totaling about 1.2 millimetersthick. Each layer is created by injectionmolding polycarbonate plastic

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Data tracks on a DVD

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DVD Format

Single-sided, Single Layer DVD

- Single-sided, single-layer DVDs can

store about seven times more data than

CDs(4.38 GB )

Single-sided, Double Layer DVD

-(7.95 GB )

Double-sided, Double Layer DVD- hold more than the standard 4.7GB of a

single-sided single layer DVD (15.9 GB )

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SINGLE SIDED, SINGLE LAYER (4.7GB)

SINGLE SIDED, DOUBLE LAYER (8.5GB)

DOUBLE SIDED, DOUBLE LAYER (17GB)

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MPEG (Moving Picture Experts

Group)

-is the name of a family of standards

used for coding audio-visual information

(e.g., movies, video, music) in a digital

compressed format.

- The MPEG compression

methodology is considered asymmetric as the encoder is more complex than

the decoder 

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Compression classified into two

types Lossless Compression

- In the lossless type of compression, nodata is lost during the compressionprocess. When the compressed file isdecompressed, the result is identical to thedata before compression

Lossy Compression

- Lossy compression reduces file size

by permanently eliminating redundantinformation, so that only a part of theoriginal data is retained and reproduced

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Flash Drive

-A USB flash drive consists of a

flash memory data storage device

integrated with a USB(Universal Serial

Bus) interface. USB flash drives aretypically removable and rewritable, and

physically much smaller than a floppy

disk

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Advantages of Flash Drive

Flash drives also store data denselycompared to many removable media.

Data stored on flash drives is impervious to

scratches and dust, and flash drives aremechanically very robust making themsuitable for transporting data from place toplace and keeping it readily at hand

Compared to hard drives, flash drives uselittle power, have no fragile moving parts,and for most capacities are small and light.

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Quiz No. 2

1. What is Peripheral device?

2. Give the four peripheral devices andtheir meaning.

3.Enumerate the different types of opticaldisc and differentiate.

4. Differentiate single layer DVD anddouble layer DVD.

5. What is the advantage of using FlashDrive compared to Optical Disc.