GET BACK HIDDEN DRIVE AGAIN IN MY COMPUTER

Start->Run->Type cmd and enter.

In command prompt type disk part and hit enter.

Then type list volume and hit enter.
       It displays drive details.

Drive letter which you want to get back.
If you want to get back volume D,type select volume D and hit enter.
       It appears select volume.

After that type assign letter D and hit enter.

Restart computer once.

HIDE DRIVE IN MY COMPUTER

Start->Run->type cmd and hit enter.

In command prompt type disk part and hit enter.

Then type list volume and hit enter.
        It will display the drive details.

Drive letter which you want to hide
If you want to hide volume D, type select volume D and hit enter.
       It appears select volume.

After that type remove letter D and hit enter.

Restart your computer once.

FORMAT PEN-DRIVE USING COMMAND PROMPT

Insert pen-drive into your PC.

Find the drive letter of a pen-drive.

Now click on Start ->Run.

In Run box, type cmd and hit enter.

Now cmd will appear, in this window format "pen-drive letter" . Eg:format g.

Hit Enter twice.

CALCULATION ON COMMAND PROMPT

The command processor CMD.EXE comes with a mini-calculator that can perform simple arithmetic on 32-bit signed integers:

C:\>set /a 2+2
4
C:\>set /a 2*(9/2)
8
C:\>set /a (2*9)/2
9
C:\>set /a "31>>2"
7

Note that we had to quote the shift operator since it would otherwise be misinterpreted as a "redirect stdout and append" operator.

For more information, type set /? at the command prompt.

COMMAND PROMPT

 List of F1-F9 Key Commands 

• F1 / right arrow: Repeats the letters of the last command line, one by one.
• F2: Displays a dialog asking user to "enter the char to copy up to" of the last command line
• F3: Repeats the last command line
• F4: Displays a dialog asking user to "enter the char to delete up to" of the last command line
• F5: Goes back one command line
• F6: Enters the traditional CTRL+Z (^z)
• F7: Displays a menu with the command line history
• F8: Cycles back through previous command lines (beginning with most recent)
• F9: Displays a dialog asking user to enter a command number, where 0 is for first command line entered.
• Alt+Enter: toggle fullScreen mode.
• up/down: scroll thru/repeat previous entries
• Esc: delete line
• Note: The buffer allows a maximum of 50 command lines. After this number is reached, the first line will be replaced in sequence.