1.2 - Memory, Storage, Units and Number Systems Flashcards
What is the purpose of RAM
Stores data that is in use
What is the purpose of ROM
Stores the computers start up instructions (bootsrap)
What is the difference between ROM and RAM
ROM is non-volatile and RAM is volatile. ROM is read only but RAM is read/write
What is virtual memory
A temporary storage space used on a secondary storage device that is used as primary memory. It is used to allow more space for running programs
Why is virtual memory needed
There is a lack of available space on the RAM for running programs
What is the problem with using virtual memory
Applications move slower because the programs need to be moved between the virtual memory and the RAM
Why can’t ROM save files
It is read only
Why can’t RAM save files
It is volatile
Why is secondary storage needed
It can store files because it is non-volatile and is read/write
What types of secondary storage are there
Magnetic, solid state drive, optical
What are examples of secondary storage and what types are they
Hard disk - Magnetic
Sold state flash memory - Flash Memory
CD-R - Optical
Solid state drive - Flash Memory
Blu-Ray - Optical
DAT tape - Magnetic
What is the smallest unit of data storage
Bit
How many bits in a byte
8
What are the prefixes for the different bytes
kilo -1000
mega-1000000
giga-1000000000
tera-1000000000000
peta-1000000000000000
How many bits in a nibble
4 (half a byte)
