Memory and Storage Flashcards
Explain the difference between volatile and non-volatile storage plus state an example of both.
1.Volatile storage is temporary and when power is turned off is lost an example is RAM
2.Non-Volatile storage saves the data even when powered off and can be stored long term an example is ROM
explain why the PC requires primary storage
is low-capacity, internal storage that can be directly accessed by the CPU
Describe and state what information is stored within RAM
RAM is Volatile storage and stores running programs and parts of the operating system. RAM is made up of a large number of storage locations that can be identified under a unique address
Describe and state what information is stored within ROM
ROM is non-volatile storage and stores the Boot program/BIOS. The BIOS loads up the operating system to take over managing the computer.
Describe and state what information is stored within Virtual memory
is used when RAM is full. it temporarily moves data not currently being used from RAM to the Hard drive/SSD This helps free up space in the RAM
justify which secondary storage would be used when Sending videos and pictures to family in Australia through the post and why
Magnetic storage would be the best as they are very portable, very durable and high capacity
justify which secondary storage would be used when Storing a presentation to take into school and why?
A USB flash drive/solid state storage would work best as it is lightweight and has high capacity.
justify which secondary storage would be used when Backing up an old computer with thousands of files to a storage device and why
Magnetic storage would work the best as magnetic tape can store large amounts of data
explain why computers use binary to represent data
all computers consist of billons of switch’s which only have two values: 0 (off) and 1 (on) this is binary
put in order from smallest to largest:
kilobyte, byte, gigabyte, nibble, megabyte, bit
bit, nibble, byte, kilobyte, megabyte, gigabyte
put in order from smallest to largest:
gigabyte, petabyte, kilobyte, byte, terabyte, megabyte
byte, kilobyte, megabyte, gigabyte, terabyte
A hard drive contains 25GB of remaining available storage space. Tim is an animator backing up video files. Each file is 200MB. How many files can he fit on the hard drive?
125 files
Samantha is a musician. She has compressed each song to 900KB. Her USB memory stick contains 1.2GB of free storage. How many songs can she fit on the USB stick?
1333
A CD has a capacity of 650MB. How many 0.2GB audio files can be stored on the CD?
3.5 or 3 whole
Explain why hexadecimal numbers are used as an alternative to binary. Use an example.
hexadecimals are easier to read and is a shorthand version of binary making it shorter and easier to make less mistakes
Convert the following values from binary to denary:
a. 00101010
b. 11011011
a.42
b.219
Convert the following values from denary to binary:
a. 35
b. 79
a.00100011
b.01001111
Convert the following values from binary to hexadecimal:
a. 11110101
b. 01100111
a.F5
b.67
Explain what an overflow error is.
when a the result in binary addition is above 255 and cannot be held because it is over 8bits and cannot be held
Add together the following binary values. If an overflow error occurs you must state one has occurred.
a. 01011001 and 01000101 [2]
b. 11011011 and 01011101 [2]
c. 00110110 and 01101011 [2]
a.10011110
b.00111000 there was a overflow error
c.10100001
What is a character set and why are they needed?
these are necessary as they allow computers to exchange data to humans and humans to input data
Describe 3 differences between ASCII and Unicode.
ASCII has 8 bits and 256 possible characters and American standard code UNICODE is multi cultural being able to use many languages and has 16 bits and over 60,000 possible characters
A text file uses the Unicode character set and contains 150 characters. What would the file size be in kilobytes?
150x16=2400
what is the file size calculation
file size = resolution x Color Depth
