1. The power supply is one of the most important components, thats why it is worth spending the money to get a good one.
2. The expansion slots (PCI, AGP, ISA, etc.) allow additional functions.
3. UPS can prevent your from the data loss at power-down.
LESSON XII
Exercise 1. Read the words and word combinations.
to supersed
transfer ;
scratch
abrasion
to lead to -
double sided
dual layer
Exercise 2. The following terms you should know.
fixed media ,
removable media ,
to pull from , ()
backup device () ,
drive
to hold ,
hard drive (HDD)-
read arm
coil ,
to burn
pit
data density ( )
CD)writer/burner CD-, ( -)/ -
READ AND TRANSLATE THE TEXT
Class 2 Components. Storage
Sometimes one can distinguish between "fixed media" (the hard drive) that is more or less permanently mounted inside the computer case, and "removable media" (just about every other kind of media) that is easy to pull from one computer and put into another computer.
Floppy Disk drives. The first 8-inch floppy disk design was invented in the late 1960s by IBM, but these floppies were used only by a very limited group of people. Some time later 5.25" floppy disc was introduced and used in the 1980s. And only 3.5" floppies are supposed to be the most commonly used storage media. They hold from 400KB up to 1.44 MB. Floppy disks have largely been superseded by flash drives as a transfer medium, but are used as backup storage in our country. At the beginning of 2006 it was announced that all the floppy manufacturers would stop to produce such a product.
A hard drive (often called HDD) consists of one or more magnetic disks and a read arm with two electromagnetic coils for each disk. Each hard disk is divided into many sectors, each containing a certain amount of data. It is the cheapest and most common way to store a lot of data in a small space.
CD-ROM drive is a standard format for storing a variety of data. A CD-ROM holds about 700 MB of data. The media look like a small, somewhat flexible plastic disc. Any scratch or abrasion on the data side of the disc can lead to it being unreadable.
CD-RW drive supports the creation of CD-R and CD-RW discs, and also function as CD-ROM drives. These drives use low-powered lasers to 'burn' data into the active layer of the disc. Many CD writers (also known as 'burners') are now combination drives which also function as DVD-ROM drives. Most DVD-RW drives also have CD-RW capabilities.
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DVD-ROM drive. This optical drives work on a similar principle to the CD-ROM, with a laser being used to read data stored in pits on the surface of a reflective disk. DVDs are read using a shorter wavelength of light. Besides a greater data-density, DVDs may be double sided and may be "dual layer".
DVD-RW drive works with DVD-discs and dual-layer disks (dual layer equipment and disks are now becoming more affordable).
VOCABULARY EXERCISES
Exercise 1. Find English equivalents:
, , , , , , , , .
Exercise 2. Read the following statements and name the kind of discs. You should choose only from: CD-RW, CD-R, DVD.
These discs are 'write once' - once they have been written to, the data cannot be erased or changed.
This disc has two layers for data storing.
These discs can be rewritten or erased multiple times.
Multisessions can be created and more data can be added to use this disc more than one time.
This disc can hold about 4.7 gigabytes.
This kind of discs is more expensive than two other ones.
Exercise 3. Read the following small text and answer the question: How can we find out the speed our data will be written on the disc?
CD-RW drives will typically have three speed ratings - one for reading discs, one for writing CD-R discs and another for writing CD-RW discs. Speed ratings vary from 1x to 52x, where 1x means that a CD is written/read in 'real time'. For example, a 52 minute audio CD would take about 52 minutes to create at 1x speed, and about 1 minute at 52x speed.
CD-drives have different speeds for any special purpose whether reading or writing discs. The specifications of any drives include the information about these speeds. Just the same situation we have with the discs of any kind. The speed on which it can be read or written is indicated on the surface of the discs.
The data can be written to the disc in a variety of formats to create an audio CD, a data CD, a video CD or a photo CD. The audio CDs should play on most standard audio CD equipment and the video and photo CDs will play on many consumer DVD players.
LESSON XIII
Exercise 1. Read the words and word combinations.
to generate
light
to enable
to prevent
confusion
rodent
to track
LED light
wireless
to be tied to ,
to sell (sold,sold)-
row
switched
extra ,
choice
Exercise 2. The following terms you should know.
CRT , -
LCD
sound output
GUI (graphical user interface)
track ball ( )
QWERTY QWERTY ,
layout
number pad ,
to bring up (program)-
to hook up to
