Essay On Data Storage

Data Storage
A computer contains various components such as input devices, output devices and CPU etc. We also use a number of other things such as instructions, program etc. All these are of no use if you do not have data to work with. Data can be stored only in the data storage unit. A storage is the essential component of any digital computer. It is required in a computer to store programs and the data processed by programs.
Modern computers have incredible speed of processing because of fast access time. Access time is how long it takes for a character in memory to be passed to or from the CPU. Similarly Computer systems have many more characters like Volatility, Access Method, Portability, Cost Capacity etc. By these capabilities Computers today have gained access to every aspect of our life. It is the most wonderful and versatile tool ever invented by man.
Current computers can manipulate and provide data in fractions of second. Computer speed is measured in units of millisecond (one thousandth of a second), microsecond (one millionth of a second), nanosecond (one billionth of a second), and pico second (one trillionth of a second). Advanced computers, including recent microcomputers called super microcomputers, operate in nanoseconds and can carry out millions of instructions per second (MIPS
Computer has huge storage capability. For a personal computer, 128 MB RAM is almost a standard toady. The main memory can be upgraded further by inserting RAM chips that are available in modules of 64 MB, 128 MB and so on. Cache memory is also available in Pc. Cache memory is faster access memory device and hence it improves processor performance.
Computer can be programmed to function automa...

... middle of paper ...

...wn or not thrown..
• Throw: A program throws an exception when a problem arises

Syntax
Try
'Statements that might produce a runtime error
Catch
'Statements to run if runtime errors occur
Finally
'Optional statements to run whether an error occur or not
End Try

Example:Test for Multiple Runtime Errors:

Try prTextFile.StartInfo.FileName = ("C:Program FilesErrorHandlerVbError.txt ") prTextFile.Start ()
Catch When Err. Number = 53 'If File Not Found Error
MessageBox.Show ("Unable to locate the desired file")
Catch When Err. Number = 7 'If Out of Memory Error
MessageBox.Show ("Are you sure about the file Path")
Catch
MessageBox.Show ("Problem Loading File")
Finally
MessageBox.Show ("Error Handler Complete")
End Try