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    DIFFERENCE BETWEEN RAM AND ROM  SSD

     The differences between RAM and ROM are as follows:  SSD stands for  Solid State  Drive.  It is the latest
                     storage  device  that  uses  flash memory  to  store
     RAM  ROM
                     data.  It is more durable and faster than a hard

     It stands for Random Access Memory.  It stands for Read-only Memory.  disk  as it  has no moving  parts. It has a short

     It is a volatile memory.  It is a non-volatile memory.  read-access time that speeds up the computer.

     It helps the computer while it is working.  It helps the computer to start.  CD
                          CD
     It is a high-speed memory.  It is slower as compared to RAM.  A Compact Disc (CD) is a shiny, circular disc that can store up to 700

     Example: Playing games, writing in a  Example: Booting up a computer.  MB of data. It needs a CD drive to read the data. It is used to store
     document, watching videos, etc.  data such as music, videos or software.

     RAPID RECALL  Tick ( ) if you know this.
                           An optical disc uses a low-powered laser beam for writing and reading information.
     1.  Computers store data using only two numbers, 0 and 1.   CDs, DVDs, Blu-ray Discs are optical storage devices.

     2.  Primary memory is also known as Internal memory.
                     DVD

                     DVD stands for Digital Versatile Disc or Digital Video Disc. It is an
                     optical storage device that looks like a CD but offers a much larger

     SECONDARY MEMORY  storage capacity, ranging from 4.7 GB to 17 GB.

     Secondary memory is permanent in nature. It is used to save work for a longer   BLU-RAY DISC

     period of time. The CPU cannot access data directly from secondary storage; the   A Blu-ray Disc is an optical disc that uses a blue-violet laser. It can
     data must first be copied to the primary memory (RAM), which makes it slower.  store up to 25 GB on one side and 50 GB on both sides, which is
                                         about five times more than a DVD.
     However, secondary memory is essential because it is cheaper and has much larger

     capacity than primary memory. The devices associated with secondary memory   PEN DRIVE
     are called secondary storage devices. Let us discuss the various types of secondary   A Pen Drive or USB Flash Drive is a portable storage device that
     storage devices.
                     connects through a USB port. It uses flash memory to store data and
     HARD DISK       comes in different sizes like 4 GB, 8 GB, 16 GB and more.

     A Hard Disk or Hard Disk Drive (HDD) is a common storage device
     that  uses  flat  round  magnetic  disks,  called  platters,  to  read  and
     write data. It is fixed inside the CPU cabinet/box. When you save any   A USB port is used to connect external storage devices to a computer for
                                                         data transfer.
     document or download a game, it gets stored on a hard disk. Hard
     disks are available in various storage capacities such as 512 GB, 1 TB, 5 TB and more.

                                                                                                  Computer Memory       11

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