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Why are there so many types of storage devices?

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Why are storage devices needed in a computer?

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Types of storage devices.
Primary storage devices (RAM)
Secondary storage devices (Hard Drive)
Removable Storage
Internal Storage
External Storage

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What are storage devices?

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EXAMPLES

Bluetooth Devices

Infrared Devices

Modem (over phone line)

Network Card

Smartphone

Wi-Fi Devices

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Why do computers need communication devices?

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ERRORS

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What is it?