1.2 - Memory and Storage
1.2 - Memory and Storage
This unit covers how and why we network computers together. You will study the advantages and disadvantages of networking computers as well as what a protocol and topology are.
Embedded Files
The booklet will be available for you to complete on teams.
1.2.1 - Primary storage (Memory)
The need for primary memory
The difference between RAM and ROM
The purpose of ROM in a computer system
The purpose of RAM in a computer system
Virtual memory
1.2.2 - Secondary Storage
The need for secondary storage
Common types of storage:
Optical
Magnetic
Solid state
Suitable storage devices and storage media for a given application
The advantages and disadvantages of different storage devices and storage media relating to these characteristics:
Capacity
Speed
Portability
Durability
Reliability
Cost
1.2.3 - Units
The units of data storage:
Bit
Nibble (4 bits)
Byte (8 bits)
Kilobyte (1,000 bytes)
Megabyte (1,000KB)
Gigabyte (1,000 MB)
Terabyte (1,000 GB)
Petabyte (1,000 TB)
How data needs to be converted into a binary format to be processed by a computer
Data capacity and calculation of data capacity requirements
1.2.4 - Data Storage
Numbers:
How to convert positive denary whole numbers to binary numbers (up to and including 8 bits) and vice versa
How to add two binary integers together (up to and including 8 bits) and explain overflow errors which may occur
How to convert positive denary whole numbers into 2-digit hexadecimal numbers and vice versa
How to convert binary integers to their hexadecimal equivalents and vice versa
Binary shifts
Characters:
The use of binary codes to represent characters
The term 'character set'
The relationship between the number of bits per character in a character set, and t he number of characters which can be represented, e.g. ASCII, Unicode
Images:
How an image is represented as a series of pixels, represented in binary
Metadata
The effect of colour depth and resolution on:
- The quality of the image
- The size of an image file
Sound:
How sound can be sampled and stored in digital form
The effect of sample rate, duration and bit depth on:
- The playback quality
- The size of a sound file
1.2.5 - Compression
The need for compression
Types of compression:
Lossy
Lossless
1.2.1 to 1.2.3
Test revision material
In a Nutshell - This is where is go through everything in the units in an easy to digest video
Questions Video - Here is me answering some sample questions and similar ones will appear in the exam.
1.2.4 - Numbers:
Test revision material
In a Nutshell - This is where is go through everything in the unit section in an easy to digest video
Questions Video - Here is me answering some sample questions and similar ones will appear in the exam.
1.2.4 - Sound:
Test revision material
In a Nutshell - This is where is go through everything in the sound section in an easy to digest video
1.2.4 - Characters and Images
1.2.5 - Compression
Test revision material
In a Nutshell - This is where is go through everything in the unit sections in an easy to digest video
Questions Video - Here is me answering some sample questions and similar ones will appear in the exam.
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