worksheet 6

 

                                 Computer Applications

 Class IX

Types of Hardware (chap-2)

 

 


Storage Devices

 Primary Memory has a limited storage capacity and is not permanent, secondary storage devices are used to store large amount of data permanently. There are various types of secondary devices available. Some most common storage devices are:

v Hard disks                   Magnetic

v Floppy disks                   Media

 

v CD ROMs                       Optical

v  DVDs                               Media

Hard Disk - The hard disk drive is the main, and usually largest, data storage device in a computer.  It can store anywhere from 160 gigabytes to 2 terabytes.  Hard disk speed is the speed at which content can be read and written on a hard disk.  A hard disk unit comes with a set rotation speed varying from 4500 to 7200 rpm.  Disk access time is measured in milliseconds.

Optical Disc - Optical disc is any storage media that holds content in digital format and is read using a laser assembly is considered optical media.  The most common types of optical media are – Blu-ray (BD) – Compact Disc (CD) – Digital Versatile Disc (DVD)

Cloud Storage - Cloud storage means "the storage of data online in the cloud," wherein a data is stored in and accessible from multiple distributed and connected resources that comprise a cloud.  Cloud storage can provide the benefits of greater accessibility and reliability; rapid deployment; strong protection for data backup, archival and disaster recovery purposes.  Examples: – Google Drive , Flickr, Microsoft Sky Drive.

 

1.    Floppy disks –   The floppy disks were one of the oldest type of portable storage devices that could store up to 1.44mbs of data but now not used in computers of today.

   

2.     Compact Disks (CDs)- The compact disks or CDs are optical media. The CDs are relatively cheap and have a storage capacity of upto 700MB. CDs come in variety of forms eg, CDROM (read only memory), CD-R(Recordable), CD-RW(Rewritable).

3.  DVDs- DVD is an optical storage device that looks the same as a compact disc but is able to hold about 15 times as much information and transfer it to the computer about 20 times as fast as a CD-ROM. A DVD, also called a Super Density disk(SD), can hold upto 17 gigabytes of data or four hours of movies on a side. DVDs come in these varities- DVD-ROM, DVD-R, DVD-RW.

 

4.    Pen/Thumb Drives- Flash Memories- The pen drives and cell phones of today use flash memories. It is called Flash memory, USB memory, Key memory. Flash is a solid state memory i.e. it has no moving parts. It works in a similar way to RAM but difference is that data is retained in flash memory even when the power is switched off.

 

 

5.    Blu-Ray disc- Blu-ray is the successor to DVD. The format’s name comes from the fact that a blue laser reads from and writes to the disc rather than the red laser of DVD players.  Blu-ray disc can store much more data in the same 12 centimetre space. These days Blu-ray discs of capacity 25GB, 50GB are commonly available. Also available in triple layer 100gb and soon will available in quad level 128gb.

 

6.    Memory Stick- A memory stick is a type of removable memory card that connect to a computer or other piece of electronic equipment to copy and store information. Memory sticks are used as storage media for a portable device e.g. in digital cameras, Smartphone, camcorders, music players or portable play stations etc.

 

                                             

7.    Difference between Primary memory and secondary memory-

Primary Storage

Secondary Storage

·       Memory is directly connected to and accessed by a computer’s CPU

·       Volatile (RAM)

·       Direct access by CPU

·       Faster data access

·       Used for processing data

·       Small size

·       Not directly connect to a CPU.

 

 

·       Non volatile

·       Indirect access by CPU

·       Slower data access

·       Used for storing data

·       Large size

 

 

Youtube support, Topic- Storage devices, please visit the link

https://www.youtube.com/watch?v=8im_WGPtQTs     https://youtu.be/iauwsaNJph0

                

         Assignment 1 May2020 (Chap2):-

                Q1.  Multiple Choice Questions:-

i) Which type of memory can read data but can’t write data?
  A. Random only memory
  B. Random-access memory
  C. Read-only memory
  D. None of the above

ii) Which one is volatile?
  A. DROM
  B. Secondary memory
  C. RAM
  D. Random Only memory

  iii)  RAM of a computer is
       A. External Memory
       B. Internal Memory
       C. Auxiliary
       D. None of the Above

iv) This memory is for short term storage and is lost when the computer is turned off.

  A. ROM
  B. CPU
  C. Hard disk
  D. RAM

v) Internal memory is also called

  A. Main Memory
  B. External Memory
  C. Auxiliary Memory
  D. Secondary Memory

 

Q2. Different storage media have different capacities. Some media can be written once by the user, some many times. The table below lists a number of different storage media. Complete the table to show the characteristics of each:

           Description: C:\Users\Administrator\Desktop\school\maths assignment\Capture.PNG

Q3. Put the following characteristics alongside the appropriate type of  

            memory chip:

• volatile                  • non-volatile

• stores the start-up program

 • stores the program being worked on

 • data put in during manufacture

 • data can be changed.

a.     RAM..........................................................................................................................................................................

b.     ROM ..................................................................................................................................................................................

 

 

 

Note- Students need to note down the study material in the notebook.  Also attempt the assignment and do it correctly.

 

 




Sachin singh

   Faculty of

Computer Science

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