9 - External Hardware Devices & Storage
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What are two advantages of purchasing a file server that uses SSDs?
• Lower power consumption • Faster access times, transfer rate, lower latency
What are two disadvantages of purchasing a file server that uses SSDs?
• Higher cost per megabyte • Higher error rate over time
What type of media does a hard disk drive use?
Magnetic media
What type of media does a CD-ROM use?
Optical media
What is one key difference in how data is read between hard disk drives and CD-ROMs?
Hard disk drives use magnetic induction, while CD-ROMs use a laser and sensor.
Fill in the blank: A hard disk is split into ______, whereas a CD-ROM follows a spiral track.
sectors/tracks
How is data access speed different between hard disk drives and CD-ROMs?
Hard disk drives can transfer/access data faster than CD-ROMs.
Why is the storage capacity for a DVD disk larger than that of a CD?
• Spiral spacing on DVD is closer/smaller • DVD is multi-layered/double-sided
Define a peripheral.
A (hardware) device that is not part of the CPU and is external.
What is one difference between primary and secondary storage?
Secondary storage is non-volatile, while primary storage is volatile.
True or False: Secondary storage is directly accessible to the processor.
False
List the steps involved in the operation of an RFID system.
• Reader sends radio frequency energy/wave • Energy reaches the RFID tag’s antenna • RFID tag is energised by the reader • Transponder sends the data signal • Reader receives the data signal near the exit
What is a key characteristic of how data is stored in an SSD?
Data is stored electronically with no mechanical/moving parts.
What must be done before a block of data can be overwritten in an SSD?
A block must be erased.
Describe how a laser printer operates.
• Bitmap of image built in memory • Negative charge applied to drum • Laser beam directed at drum • Charge neutralised where laser strikes • Negative charge applied to toner • Toner sticks to drum based on charge • Paper passed over drum to transfer toner • Positively charged transfer roller assists transfer • Heater fuses toner onto paper • Four different colour toners required for colour printing
Describe how a digital image is captured by a digital camera.
• Light enters through the lens • Each sensor produces an electrical signal • Signal represents a pixel • ADC converts light intensity into binary data • Colour filter generates separate values for RGB • Pixels recorded as a group/array
How does an optical disk drive read data from a disk?
• Low power beam of laser is shone at disk • Light is focussed on the track • Some light is reflected back • Amount of light reflected is measured • Disc spins at constant linear velocity
How is data represented on an optical disk?
• Data is stored on a spiral track • Continuation of land/pit reflects light • Transition between land and pit indicates a 1, continuation represents 0