Secondary Storage
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What does Volatile mean
Memory that requires power to maintain the stored information - Memory is lost when there is no power
What does Non-Volatile mean?
Data is not lost when there is no power, not accessed directly by the CPU
What is Exam Tip 1?
Always say if it is internal or external when choosing a suitable device
What is storage medium?
Where data is stored and retrieved from
Why is a storage device needed?
To access the storage medium
What are 3 examples of storage devices?
DVD , Blu-ray disk and CD
What is the purpose of secondary storage?
Used to store data, programs and the operating system when the computer is turned off and Can be used to transfer between devices (if storage medium is portable)
What is a Kilobyte represented as?
kB
What are 3 examples of magnetic storage?
Hard Disk Drives, Magnetic Tape and Floppy Disks
Why are hard disk drives easily broken?
Lots of parts are not secure
Why is magnetic tape used?
It can back up and archive data in large volumes
What are solid state drives referred to as?
Flash memory
What are 2 examples of solid state drives
USB Memory Stick Memory Card
What are 5 reasons why a SSD is better than a HDD?
Read-write speeds are faster No moving parts (less likely to suffer damage) Less power needed Faster access speeds Smaller (easier to move)
What are 2 reasons why a HDD could be better than a SSD?
Cheaper More storage
What is the difference between a blu-ray disk and a Digital Versatile Disk?
Blu-ray has better quality as there is more capacity
What are 3 examples of optical storage?
Compact Disks (CD) Digital Versatile Disks (DVD) Blu-ray Disks (BD)
What are pits and lands?
They represent the binary information of the data stored on a disk
What are pits?
The bumps burned by lasers
What are lands?
Areas not burned by lasers
What does a change from a pit to a land represent in binary?
1
What does a change to a land to a pit represent in binary?
1
What does no change represent in binary (pits and lands)
0
What is CD ROM used for?
Generally music as it is read-only