IN SPITE OF HAVING SAME PHYSICAL SHAPE WHY DVD HAS MORE CAPACITY THAN CD

I know it is very old question to discuss, but i want to make it more clear today ... Just want to say that CD and DVD has same physical shape but still having different size ..WHY????? And even DVD's are of different sizes in the market...
Do you know a DVD holds about 7 times larger data than CD..
In simple tone it is said that DVD has higher capacity than CD due to one main reasons that are...
1)A DVD uses a different laser with a smaller wavelength to record data..Hence it can store larger data than    CD.

But i want to discuss it briefly. DVD can store more data than CD because of three main reasons that are mentioned below:
1)Higher-Density data storage
2)Less overhead, more area
3)Multi-layer storage

Lets discuss the above reason...
1)Higher-Density data storage :- A standard DVD can store 7 times more data than CD..This is because pits and tracks are smaller in DVD's in comparison to CD's.
By reading above we can guess about how much data will be available on DVD more than CD due to tighter pits and tracks. The track pitch on a DVD is 2.16 times smaller, and the minimum pit length for a single-layer DVD is 2.08 times smaller than on a CD. By multiplying these two numbers, we find that there is room for about 4.5 times as many pits on a DVD. So where does the rest of the increase come from?

2)Less overhead, more area :-
On a CD, there is a lot of extra information encoded on the disc to allow for error correction -- this information is really just a repetition of information that is already on the disc. The error correction scheme that a CD uses is quite old and inefficient compared to the method used on DVDs. The DVD format doesn't waste as much space on error correction, enabling it to store much more real information. Another way that DVDs achieve higher capacity is by encoding data onto a slightly larger area of the disc than is done on a CD.

3)Multi-layer storage :-

This facility has increased the storage capacity between varieties of DVD's...A DVD has multi layer storege capacity means it can store information in form of layers..A DVD has maximum 4 layers i.e 2 layer at each side..

Hope you got the answer ...

DO YOU KNOW THE DIFFERENCE BETWEEN SLEEP AND HIBERNATE OPTION IN COMPUTER

From the past few days i was confused whether to use SLEEP or HIBERNATE..I searched many fact about both the term and found there are differences between them..And we have to use this two option wisely according to our use.
I know most of them know about it..But still i want to share this post as it was useful to me..
In many cases both the options play the same role but they have the differences too..

SLEEP also called as standby mode reduces the power consumption to a very low state but it needs some power to continue that stage of stand by..People uses SLEEP mode to quickly open the laptop as it does not take time by pressing the power button...We can use the SLEEP option only we have to open the laptop in a short while as it needs some continuous power supply to stay in SLEEP mode. Most of the documents are also closed in SLEEP mode..

But the case is different in HIBERNATE mode..HIBERNATE mode uses zero power consumption...This mode can be used when we want to turn of the computer for a long time...This mode can also be used when we don't want to close our documents..

So friends use this option wisely as it will save your battery and also your open documents before shutdown..

MAKE NATIONAL FLAG USING GRAPHS

HAPPY INDEPENDENCE DAY

Today is 15th Aug and we all know it as our independence day..So lets respect our motherland and our national flag...I have made our national flag in excel using graphs..want to make the same follow the step below in the image..

LIMITATIONS OF RECYCLEBIN

As we all know recyclebin is placed on our computer desktop to retrieve data that were accidently deleted.
But do you know there are some limitations of recyclebin... Some data deleted accidently cannot be retrieved from recyclebin.. Today i am going to discuss about some limitations of recyclebin. Mainly there are three limitations of recyclebin..
Here are the three limitations of recyclebin :-

1)Files deleted from removable media (i.e memory card, pen drive, usb, jump, flash drives, external hard drives) connected via USB, Bluetooth are deleted permanently..

2)Files deleted through command prompt are also deleted permanently.

3)A recyclebin has a definite size to hold data..It starts to delete data to make space when the volume deleted exceeds its memory limit..

So dear friends be careful about deleting the data from above places..Otherwise you will not be able to retrieve data from there..

Tips for printing in Microsoft word, Excel etc

You would have printed the pages from Microsoft word, Excel etc...You would have also printed single page,multiple page or range of page...But do you know you can also print a section or a part of page...

If you know it already it is very good, but if you don't know it read it ,it might help you..

If you want some portion of page only to be printed as it contains necessary information you can print it....

You just have to follow some simple steps:-

Lets see how to print a section of page..

Step 1 :- Select the text you want to print the from the given page..

Step 2 :- Click on Print option from file menu or press ctrl+p....

Step 3 :- Check the option "Selection" in the column Page range..

Step 4 :- click on ok button..

Now you will see the text you have select is only printed on the page....So be efficient while printing the documents from next time onwards...enjoy and have fun...

WHY SPACEBAR IS SO BIG ON THE KEYBOARD

We all know that spacebar is the longest key on the keyboard.. You would be thinking why...
Do you know  in early days when people used mechanical keyboard also called typewriter, the spacebar coverd the full width of the keyboard at the bottom...
Later on when technology developed and electronic keyboard came into act the spacebar was reduced to some fixed length and was centrally placed at the bottom of the keyboard...
There is only reason behind the longest key for spacebar...But different people say it in different manner or you can say old wine placed in new bottle...It is similar in that fashion...

Let us see the most favorable reasons for the above query....

1)Its easily the most used key on the keyboard and is meant to fit all positions of your hands comfortably.

2)To fill the rest of the space on keyboard.

3)For use of spacebar easily as it is the most frequently used key on the keyboard...

4)As it is frequently used, it is made large so that we easily find it on keyboard without seeing the keyboard...


Hope all the reasons satisfied your thrust for the above querry....

WHY "QWERTY" IS ON KEYBOARD NOT "ABCDEF" ??

Yaa the big question is why the arrangement of keyboard keys are in pattren of qwerty and not in abcde..
There are many reasons to support this question...Firstly i want to say that in the begining mechanical keyboard was invented and also called "TYPEWRITER" ..So the pattern was used according to tthe ease of working of mechanical keyboard...

Lets Discuus the reason behind the keyboard patternnnn.....

1)We start with the begining of the era of mechanical keyboard i.e "TYPEWRITER"...The pattern was so arranged to improve the working of typerwiter and to handle some technical pattern..When the pattern was arranged in abcde pattern where the keys were very closed to each other...They used to get stuck to the ribbon of the typewriter...Inorder to solve this QWERTY  layout keyboard was designed in that era so that it would made them easy for typing..

2)Now lets come to the common use of keyboard now...If the keys on keyboard were arranged in ABCDE fashion then we would have to type mostly with left hands....

3)One more reason behind the layout of QWERTY keyboard is that the mosr used keys are placed on right hand side and we use right hand for typing the most use keys...

4)From the mechanical era to the new technology keyboard, the pattern started from correcting the errors of stuck keys in typewriter and it moved towards utilising both hands with same ratio and making the typewriting easy..

If the Keys on the Keyboard were arranged with ABCDE pattern than we would have used some fingers of left hand for typing and the right hand finger would have been underused and typewriting would have been boring...
Isliye to kehte h jo hota h ache ke liye hota h...so enjoy typing.....

Make a computer prank

HEY FRNDS JUST I AM SHOWING U HOW TO MAKE A COMPUTER PRANK...U CAN USE IT ON UR FRNDS PC TO MAKE FUN OF HIM....



This is step by step tutorial that explains how to make windows batch file that open the notepad file continuously.This is non-destructive prank to your computer system. If you want to have some fun with your friends , drop this cool prank into his pc. .


1) Launch Notepad

2) Type this code into notepad

@ECHO off
:top
START %SystemRoot%\system32\notepad.exe
GOTO top

3) save as filename.bat for example notepad.bat

NOW U JUST HAVE TO CLICK ENTER ON THE FILE notepad.bat AND THE MAGIC BEGINS......
Give your valuable comments below...

Attack of WORLD TRADE CENTRE trick in notepad...

The Flight number of the aeroplane  that was used in the attack of  Twin towers of world trade center on 9/11 was "Q33NY"...

Now let me show you a trick based on the attack of twin towers of world trade center....
Follow this steps and you will be amazed to see the output....

1)Open the notepad..
2)Type Q33N
3)Increase its font size to 72..
4)Change its font to Wingdings..

See the output:

==






The figure obtained in notepad is somehow similar to the figure of the attack of twin towers of world trade center....

I can only say that it is a coincidence rather than a trick...

Leaving all that i hope you all will enjoy watching this trick...Try it now and have fun....

WHAT IS THE ACTUAL USE OF A REFRESH BUTTON IN COMPUTER

We all computer users usually refresh our computer by right clicking the mouse and selceting Refresh option or by pressing F5 from the keyword....My question is , Do we actually know why we refresh our computer...Hope some may be knowing the actual reason and some may be knowing the wrong reason...

MYTH
Before discussing the right reason let me first tell you the wrong reason or myth that most users have about the refresh option in computer..We user think that refresh option is use to make computer updated after any changes made in RAM so that our computer will run more smoothly and will work faster....

If you are thinking like that, then i am sorry to inform you that it is not true...It does not make your computer work faster....Below i will give you the correct reason for this..

CORRECT REASON
 Refresh option is used to update the display or update the look of desktop after a change(i.e delete,update,copy,paste,cut etc)....Let me make you more clear by giving you the example...

EXAMPLE
Suppose you have added an image in a folder...The image shown after paste is not in alphabetical order..But when you refresh the computer it is shown arranged in the alphabetical order...

So if you are refreshing your computer very often...Stop doing that...It is just a waste of time..It will not make your computer run faster or smoothly..

Hope you liked it and give your valuable comments below...

Make Your Favourite video as a wallpaper on your pc

Many of you were thinking that you would make your favourite video as your wallpaper on your pc...
Ya you cand do it by reading this post...just follow the given instructions below and you will see your favourite video playing on your screen as wallpaper...

STEPS :-

1) Open VLC Media Player on your computer.

2)Click on tools and select Preferences.

3)Click on video at left side and select Directx video output and click on save..

4) Play any video from VLC Media Player and click on Video and Select Directx Wallpaper.





5)Minimize the vlc media player and watch your faourite video playing on your desktop as wallpaper....
Just try it now and comment if you realy liked it...

SOME COMPUTER FACTS

BELOW I'M GOING TO MENTION SOME FACTS ABOUT COMUTER THAT WILL MAKE YOU FEEL HAPPY TO KNOW ALL ABOUT THIS...AND IF YOU ARE A COMPUTER ENGINEER YOU MUST KNOW IT...SO HERE I INTRODUCE YOU WITH SOME OF THE FACTS....

1)2nd December is observed as "COMPUTER LITERACY DAY"..
2)First indian newspaper to be available on internet is "THE HINDU".
3)First indian magazine to be available on internet is "INDIA TODAY".
4)First magazine on computer is "COMPUTER AND AUTOMATION"..

And this one is for those who are interested in programming...

5)First computer program was developed  by "LADY ADA AUGUSTA"..

Last one but its the origin...

6)The word computer has been derived from english word "COMPUTE" , which means to calculate.

Hope you liked it and got some information.....