Ch-5 Secondary Storage Devices


Q1) Fill in the blanks:

a.Secondary memory is used in computer system because primary memory is….

b. Hard disk is…… memory of computer.

c. Examples of optional disks are ….and….

d. SSD lacks physical……. disks. 

e. Magnetic tape is ……….access device. 

f. Sixteen bits equal to……. byte.

volatile b) secondary c) CD and DVD d) spinning e) sequential f) two


Q2) State whether the following statements are True or False:

a. RAM is a volatile memory of computer.

b. The new high-performance hard disks rotate at 7200 rpm - 10,000 rpm.

C. ROM is non-volatile memory of computer.

d. A hard disk consists of one or more metal platters coated with magnetic material.

e. Magnetic disks follow direct access mode for reading and writing data.

All statements are TRUE

 

Q3) Full Forms

RPM = Revolution Per Minute

CD-ROM = Compact Disk Read Only Memory

DVD = Digital Versatile Disk

MB = Mega Byte

GB = Giga Byte

BITS = Binary Digits

CD-RW = Compact Disk Re-writable

PB = Peta Byte

EB = Exa Byte

 

4. Match the following

RAM-Volatile Memory

Nibble-collection of 4bits

SSD-Lack of spinning

BIT- 0 or 1

ROM-Non Volatile memory

Hard Disk-Spinning Platters

 

5.  Name the technical terms for each of the following statements:

a. A non-volatile storage medium that can store all the data and instructions even after the computer is turned off. 

b.  Storage device based on flash memory technology. 

C. A removable round, flat piece of plastic disk used to distribute software and transfer data between computers and create small backups.

d. A storage disk from which data is read and in which it is written by lasers.

e. Combination of 1024 GB.

f. Volatile memory of computer that stores data till the power is on.

a) Secondary Storage Media b) SSD            c) CD/DVD     d) Optical Disk           

e) 1 Tera Byte (TB)    f) RAM

 

6. Choose the best alternative for each of the following:

a. An example of random storage media is

i. Magnetic tape          ii. Hard disk                iii. Both I & II             iv. None

b. Storage cost of the optical disk is

i. Very high                 ii. Reasonable              iii. Very low                iv. None

C. The Solid-State Storage is

i. Primary memory                   ii. Secondary memory             iii. Optical memory                 iv. None

d. A storage media that stores data permanently is called

i. Primary memory                   ii. Volatile memory                 iii. Non-volatile memory    iv. None

e. Primary memory of computer is

i. Hard disk     ii. DVD                       iii. RAM                      iv. SSD

(a) Hard Disk (b) Very low    (c) Secondary Memory           (d) Non-volatile Memory (e) RAM 


7. Short answer questions:

1. What is primary memory?

Primary Memory is also known as main memory, it is a computer's immediate and volatile storage space.


2. What is non-volatile memory?

Nonvolatile memory is a memory that can store data permanently. It does not lose it contents even when the power supply to the computer is terminated.

 

3.  How many bits make 1 byte?

8 bits make 1 byte.

 

4. Which technology is used to read and write in optical disk?

Laser optics technology is used to read and write in optical disk.

 

5. Which storage media uses sequential access techniques?

Magnetic tape is a storage media uses sequential access techniques.

 

6. Which memory is called non- volatile memory?

Flash memory is called non- volatile memory.

 

8. Long answer questions:

 

1. What is secondary memory of a computer? Give two e.g.

Secondary storage device is a non-volatile memory of computer that stores data and programs for the future use.

e.g.-USB,CD/DVD

 

2.  What is magnetic tape? Write its advantages and dis advantages?

Magnetic tape is also known as sequential access media, it is a secondary storage medium which is used to store data, information for future references. It looks like the tape used in cassettes and is coated with magnetic material. 

e.g.- audio tape, video tape, computer data tape

 

advantages:

Magnetic tape are easily transportable because they are light and compact in size.

they are cheap mode of offline data storage.

 

dis advantages:

Data transmission in magnetic tape is slow.

Magnetic tape is sequential in nature.

 

3.What is magnetic disk? Write its advantages and dis advantages?

Magnetic disk are the most widely used and popular storage medium for direct access secondary storage. It is made up of a thin piece of plastic/ metal circular plate/ platter which is coated with magnetic oxide layer.

e.g.-floppy disk, hard disk, zip disk and super disk.

 

advantages:

·         it follow directs access mode for reading and writing onto the data files, thereby making an ideal device for accessing frequently accessed data.

·         it has a higher rate of data transfer than magnetic tapes.

·         dis advantages:

·         it must be stored in dust free environment

·         it is more expensive than magnetic tape.

 

4. What is an optical disk? Give e.g.

An optical disk is an electronic data storage medium that can be written to and read from using a low powered laser beam/

e.g.-CD-ROM, DVD, CD-RW


5. What is a CD-ROM? Why is it called so? 

 An optical disk in which data written once and read many times (WORM) is called CD-ROM. It is called so because in CD-ROM we can not write data. 


6. What is a byte? How many bytes are there in 32 bits?  

A byte is a location in computer memory consisting of eight adjacent bits. 4 bytes are there in 32 bits. 


7. What is a nibble? How many nibbles are there in 8 bytes? 

A collection of 4 bits is called a nibble. 8 bytes = 8*8=64 bits 4 bits= 1 nibble 64 bits = 16 nibble 


8. List  advantages and disadvantages of optical disks as a secondary storage media. 

 advantages of Optical Disks: 

- It is physically in strong form harder to break.

- More reliable than a magnetic disks. 


Disadvantge of optical disk: 

- Data access speed is slower than magnetic disk. 

- Reading/ writing procedures are more difficult than magnetic disk. 


i. Differentiate between sequential access and random access media with one example of each. 

Sequential Access Media:

  • Data is accessed in a specific, linear order.
  • To reach a specific piece of data, you must go through other data before it.
  • Example: Magnetic tape. You have to rewind or fast forward through the tape to find the desired information.

Random Access Media:

  • Data can be accessed directly without going through other data.
  • You can quickly jump to any piece of data.
  • Example: Hard drive. You can directly retrieve any file stored on the disk without having to go through other files.

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