Page 67 - open office
P. 67

Platter
                                                 Spindle
                                                                            Head

                                                                                Head Actuator Arm
                                        Actuator Axis
                                       & Pivot Screw


                                              Voice Coil                           Power Connector
                                               Actuator
                                                                               Jumper Block
                                                                       Ide Connector On Printed
                                                                       Circuit Board (Interface)



                        Do you know?


                         Hard Disk is also known as Winchester Disk.



                 Optical Disc: Optical Disc is commonly used as an external storage device in which a laser beam helps to read
                 data from the  at surface of the optical disc.

                   CD: CD or Compact Disc is a common optical disc. It is made up of lightweight plastic
                   material with a chemical coating on one side where data is stored.
                   It is inserted into a CD/DVD drive or CD/DVD writer of a CPU. In CD ROM (Compact
                   Disc Read Only Memory) data can only be read whereas in CD writer, data can be read
                   and written as well. The capacity of 120 mm standard CD is 700 MB.



                                      DVD: DVD or Digital Versatile/Video Disc is an optical disc that looks like a CD but has
                                      a capacity to store data up to 17.1 GB.
                                       To read information stored in a DVD, it has to be inserted into a DVD ROM or DVD
                                      Writer or DVD player (to copy information on a DVD, one has to use a DVD writer).



                   Blu-ray Disc: Blu-ray Disc  can store data of up to 128 GB. It has been developed
                   by the Blu-ray Disc  Association (BDA).  It is more advanced  than  CDs  or  DVDs.
                   Blue-violet laser is used to read or write data on the Blu-ray disc.



                        Do you know?


                           Diameter of a CD, DVD or Blu-ray disc is 120 mm. DVD can also be of 80 mm diameter that can hold
                           data upto 1.5 GB.
                           CDs can be used or played in a DVD-ROM or a DVD player but DVD cannot be operated in a CD
                           player.
                           A combo drive is a device which contains all the features of a CD-Writer and a DVD ROM.






                                                                       Information & Communication Technology        67
   62   63   64   65   66   67   68   69   70   71   72