What is Disc , Drive and Memories in An Computer system ?

 

OPTICAL DISC

Use laser technology to read and write data on silver platter. 

 Compact Disc ( CD ) = Can store 650MB to 800MB of information and data . CD - ROM can only read data a CD-ROM.

You can store data only if you have a CD Burner and CD-R ( writable) or CD-RW ( re - writable ) CD.

DVD ( Digital Versatile Disc )

Is the size of regular CD and can be played in a regular DVD movie player .

DVD can store 4.8 GB to 8.0 GB of information and data . DVD - ROM is readable only ( a movie DVD).

 You can store data on a DVD only if you have a DVD Burner  and 

DVD + R/ DVD-R ( writable ) or 

DVD - RW ( re-writable ) DVD .

PEN DRIVE

USB ( Universal Serial Bus ) = USB also called peri - paral device . Pen drive is a compact secondary storage device . it is also known as a USB flash drive , thumb drive or a jump drive .  It connects to a computer via a USB port . It is commonly used to store and transfer data between computers . 

SD CARD

SD CARD stand for secure digital card . it is most often used in a portable and mobile device such as smartphones and digital cameras . you can remove it from your device and see the things stored in it using a computer with a card reader .

Register Memory

• Register is a small high speed memory inside CPU .
• It is used to store data and instruction & temporarily .
• Data  is  stored in register memory from main memory for execution .
• CPU contain a number of register each register has a pre - define function .
• Register size determination is how much information it can store.

Register memory is  the smallest and fastest memory in a computer . it is not a part of the main memory and is located in the CPU in the form of registers which are the smallest data  holding elements . A register temporarily holds  frequently used data , instruction and memory address that are to be used by CPU . They hold instructions that are currently processed by the CPU . All data is required to pass through registers before it can be processed so , they are used by CPU to process the data entered by the users.

Virtual Memory 

Virtual memory is a storage scheme that provide user an illusion of having a very big main memory .This is done by treating a part of secondary memory as the main memory .

In this scheme , user can load the bigger size process than the available main memory by having . the illusion that the memory is a available to load the process.