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Common Types Of Storage Ocr

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Exam code:J277

Storage devices are non-volatile secondary storage, that retain digital data within a computer system
They provide a means of storing, accessing, and retrieving data, which can include software applications, documents, images, videos, and more
There are 3 types of storage:
- Magnetic
- Solid State
- Optical

Magnetic Storage

What is magnetic storage?

Magnetic storage is a type of non-volatile media that uses magnets (polarity) to store binary 0s and 1s

Advantages	Disadvantages
Capacity – High storage	Durability – Moving parts can get damaged if dropped
Cost – Low per gigabyte	Portability – Heavy & bulky making them less convenient for transport
Speed – Moderate read/write access	Reliability – Prone to mechanical failure
	Noise – Loud (spinning disks)

Solid State Storage

What is solid state storage?

Solid state storage is a type of non-volatile media that uses electronic circuits to store binary 0s and 1s

Advantages	Disadvantages
Capacity – Medium/high storage	Cost – Very high per gigabyte
Speed – Very fast read/write access	Reliability – Limited read/write cycles
Durability – No moving parts
Portability – Small and no moving parts
Noise – Silent

Optical Storage

What is optical storage?

Optical storage is a type of non-volatile media that uses lasers to burn the surface of a disk, creating pits and lands suitable for storing binary 0s and 1s

Advantages	Disadvantages
Cost – Very low per gigabyte	Capacity – Very low
Durability – No moving parts	Speed – Very slow read/write access
Portability – Small and no moving parts	Reliability – Prone to scratches
Noise – Silent

Worked Example

Zarmeen has purchased a new tablet computer. The tablet has an internal secondary storage device.

The storage device is a solid state device.

Give three benefits of the tablet having a solid state device instead of a magnetic device [3]
Give two drawbacks of the tablet having a solid state device instead of a magnetic device [2]

Answers

Benefits
- Faster access / read/write speeds
- Smaller in physical size
- More durable // no moving parts
Drawbacks
- More expensive (per gigabyte)
- Smaller capacity (usually)
- Limited number of read/write cycles

Guidance

Portable is not enough on it’s own
No moving parts is not enough on it’s own

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