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1.2 Memory (Secondary Storage (Factors which you must consider (Capicity…
1.2 Memory
Secondary Storage
Long term storage
Eg hard disks drives
NON-Voltaile
Relatively inexpensive per MB
Factors which you must consider
Capicity
How much is stored
Speed
How quickly can the computer reads data from storage device
Portability
Can you easily unplug it and carry it away
Durability
How easily it can be damaged
Cost
Storage device vary in cost per GB
Magnetic device
They are read with moving heads inside the disk
Slow to read
Easy to damge
internal or portable
huge capcity
Serval terabytes
Volatility
RAM- described as Voltaile
When you turn off your computer it looses its content
Bootstrap Loader
Loads operating system
required to start-up the computer
ROM_Read-only memory
NON-volatile
you can leave computer switch off for months.
Temporary Storage
Can only be read, not written
Stores Users data/programs/parts if operating system which is currently in use
Memory can be written to or read
Saved onto HDD and SDD
Design for long term storage
NON-VOLTAILE
Solid state Device
Flash memory/storage
More reilable
don't get damaged eaisly
Lighter
Faster acces time than HDD
Lower power consumption
Thin
Eg. Memory stick
optical device
Eg CD
Lasers write data to the disc and read data from it
Cloud storage
saving data in off site storage system
Adavantages:
Access data from anywhere
Disadvantages:
Dependant on having an internet connection
e.g.. Dropbox