Computer studies analysis of questions and answers

Explain two problems associated with the computer hard disk.

15/1/2021

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Explain two problems associated with the computer hard disk.

Problems of computer hard disk

Excessive shock like dropping it on the hard surface may cause the platters to dislocate hence reading may be a problem
Contact with strong magnetic fields or static electricity may affect the device since data is saved magnetically.
If the case containing the platters is opened, dust may get into it causing disk crash,
Some viruses may create virtual tasks which will eventual cause the disk to be overwork hence causing it to crash
Sporadic power failure may cause the disk to crash.

Explain two problems associated with the computer hard disk.

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Give three reasons why primary storage devices are not used for secondary storage.

4/1/2021

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Give three reasons why primary storage devices are not used for secondary storage.

Vertical Divider

They are more expensive.
They hold less volume of data.
They are volatile hence cannot store information once power is off.
Its shorter access time is dependent on the memory size hence increasing the size of primary memory will eventually lead to longer access time.
ROM cannot store data

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State the purpose of each of the following memories in a computer system. RAM and Hard disk

3/1/2021

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State the purpose of each of the following memories in a computer system. RAM and Hard disk

(a) RAM
Holds data that is urgently need by the processor,
Random-access memory is a form of computer memory that can be read and changed in any order, typically used to store working data and machine code.
(b) Hard disk
Used to hold large volumes of data that is not urgently required by the processor — also for back up of OS and data.

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Give two reasons why optical disks are better storage media compared to floppy diskettes

31/12/2020

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Give two reasons why optical disks are better storage media compared to floppy diskettes (2mks)

Enormous storage capacity compared to floppy diskettes
Faster access time and data transfer rates as compared to floppy diskettes
Data Recorded on optical disks is not damaged by stray magnetic fields and surface problems like fingerprints, dusts etc.

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List five precautions that can be taken to protect data stored in diskettes

30/12/2020

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(a) List five precautions that can be taken to protect data stored in diskettes (5mks)

Avoid keeping in places of high temperatures
Avoid folding/ crushing/ dropping/ (any physical damage)
Avoid bringing close to magnet/ electrical fields
Keep in disk bank
Write protect
Keep away from dust
Do not remove while the disk drive is active
Install an up to date antivirus

diskettes

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The diagram below shows a formatted plate surface of a storage disk.

29/12/2020

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The diagram below shows a formatted plate surface of a storage disk.

Shade and label:
a) one sector
b) One block

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Name three types of optical disks.

29/12/2020

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Name three types of optical disks.

Vertical Divider

CD- ROM
CD- RW
CD- R
CD – W

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Compare the two types of diskettes used in microcomputers in terms of physical size and densities.

27/12/2020

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Compare the two types of diskettes used in microcomputers in terms of physical size and densities.

3 ½ Floppy diskette

Small in size
Bigger in capacity 1.44 MB

5 ¼ floppy diskette

Bigger in size
Smaller in capacity 1.2 MB

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Differentiate between primary memory and secondary memory

25/12/2020

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Differentiate between primary memory and secondary memory

Primary memory holds data and instructions currently in use. Also stores immediate results from processing waiting transfer to the output devices.

Primary memory is volatile, i.e. contents held are lost on power loss.

Random Access Memory

Secondary memory or backing storage refers to the storage of programs and data files, not currently being operated on.

Secondary memory is non-volatile or permanent, i.e. Contents held are not lost on power loss.

Clear differences between primary memory and secondary memory

Primary memory versus Secondary memory
	Primary Memory	Secondary Memory
1. Capacity	Low storage capacity	High storage capacity
2. Storage mechanism	Volatile (loses content when power is switched off)	Non-Volatile (does not lose content when power is switched off)
3. Speed of storage/access/retrieval of information	Fast	Slow
4. Storage terms	Store data temporary unless it is a special type of ROM	Store data permanently
5. Examples	RAM and ROM	Optical Disks such as DVDs, Magnetic Disks such as HardDisk, Solid state disks such as Flash disk and Memory stick
6. Uses	Handles data currently needed by the computer	Stores data that is needed for future reference or data being transfered from one machine to another.

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Give Two Types Of Storage Devices Used In A Computer Giving An Example Of Each.

21/12/2020

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Types of Storage Devices Used By a Computer Giving an Example of Each

Introduction;

There are various categories under which storage devices can be classified;

The duration they store information;
Mobility and;
How they function.

GIVE TWO TYPES OF STORAGE DEVICES USED IN A COMPUTER GIVING AN EXAMPLE OF EACH.

HARD DISK DRIVE

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Atika School Provides Computer studies questions and answers for KCSE preparations and Computer Science for CBC.

Explain two problems associated with the computer hard disk.

Explain two problems associated with the computer hard disk.

Give three reasons why primary storage devices are not used for secondary storage.

Give three reasons why primary storage devices are not used for secondary storage.

State the purpose of each of the following memories in a computer system. RAM and Hard disk

State the purpose of each of the following memories in a computer system. RAM and Hard disk

Give two reasons why optical disks are better storage media compared to floppy diskettes

Give two reasons why optical disks are better storage media compared to floppy diskettes (2mks)

List five precautions that can be taken to protect data stored in diskettes

(a) List five precautions that can be taken to protect data stored in diskettes (5mks)

The diagram below shows a formatted plate surface of a storage disk.

The diagram below shows a formatted plate surface of a storage disk.

Name three types of optical disks.

Name three types of optical disks.

Compare the two types of diskettes used in microcomputers in terms of physical size and densities.

3 ½ Floppy diskette

5 ¼ floppy diskette

Differentiate between primary memory and secondary memory

Differentiate between primary memory and secondary memory

Clear differences between primary memory and secondary memory

Primary Memory

Secondary Memory

1. Capacity

2. Storage mechanism

3. Speed of storage/access/retrieval of information

4. Storage terms

5. Examples

6. Uses

Give Two Types Of Storage Devices Used In A Computer Giving An Example Of Each.

Types of Storage Devices Used By a Computer Giving an Example of Each

Introduction;

Categories

Archives

Atika School Provides Computer studies questions and answers for KCSE preparations and Computer Science for CBC.

Explain two problems associated with the computer hard disk.

Give three reasons why primary storage devices are not used for secondary storage.

State the purpose of each of the following memories in a computer system. RAM and Hard disk

​Give two reasons why optical disks are better storage media compared to floppy diskettes (2mks)

​(a) List five precautions that can be taken to protect data stored in diskettes (5mks)

The diagram below shows a formatted plate surface of a storage disk.

Name three types of optical disks.

3 ½ Floppy diskette

​5 ¼ floppy diskette

Differentiate between primary memory and secondary memory

Clear differences between primary memory and secondary memory

Primary Memory

Secondary Memory

1. Capacity

2. Storage mechanism

3. Speed of storage/access/retrieval of information

4. Storage terms

5. Examples

6. Uses

Types of Storage Devices Used By a Computer Giving an Example of Each

Introduction;

Categories

Archives

Give two reasons why optical disks are better storage media compared to floppy diskettes (2mks)

(a) List five precautions that can be taken to protect data stored in diskettes (5mks)

5 ¼ floppy diskette