IT Unit 1 Digital Devices in IT Systems (part 1)

• RAM

• ROM

• CPU

• HDD

• RAM

• ROM

• CPU

• HDD

• CPU heat sink

• Power supply

• Optical disk drive

• Motherboard battery

• CPU heat sink

• Power supply

• Optical disk drive

• Motherboard battery

Input devices

• Keyboard

• Webcam

• Barcode reader

• Monitor

• Optical disk

Output devices

• Monitor

• Mouse

• Flash drive

• Speaker

• Microphone

Storage devices

• Printer

• SSD

• Floppy disk

• Magnetic disk

• Motherboard

Volatile storage

• Only maintains its data while the device is powered.

• Can maintain its data when the device is switched off.

• When too much data is stored, the storage device overheats.

• Does not physically exist as such but made by software to appear to do so.

Components of a HDD

• One or more platters

• A read/write arm

• A read/write leg

• NAND gates

Advantages of SSD over HDD?

• Greater speed of data transfer

• More robust due to no moving part

• Cheaper

• Longer lifespan