computer systems nat 4/5 computing science input, output and backing storage
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Computer Computer SystemsSystems
Nat 4/5 Computing Nat 4/5 Computing ScienceScienceInput, Output and Input, Output and Backing StorageBacking Storage
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Lesson AimsLesson Aims By the end of this lesson: Pupils will be able to:
Describe the features, functions and uses of: keyboard, mouse, microphone, touchpad, digital
camera, scanner, webcamDescribe the features, functions and uses of
monitor, LCD panel, inkjet and laser printers, loudspeakers
Compare devices using appropriate characteristics including resolution, capacity, speed of data transfer, cost
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Input DevicesInput Devices
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An input device is a device which creates some new information to put INTO the system
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Output DevicesOutput Devices
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An output device is a device which gets information FROM the system
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Input/output DevicesInput/output Devices
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You have to be able to compare these devices in terms of appropriate characteristics such as: Resolution Capacity Speed of data transfer Cost
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Backing StorageBacking Storage
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Storage TermsStorage Terms
Term Abbreviation Description
Bit binary digit, 0 or 1
BIGG
ER ->
Byte a group of 8 bits – Single Letter
Kilobyte Kb 1024 bytes
Megabyte Mb 1024 Kilobytes
Gigabyte Gb 1024 Megabytes
Terabyte Tb 1024 Gigabytes
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Sequential AccessSequential Access To go from file A to
file Z in a sequential-access system, you must pass through all files in order.
Sequential access is sometimes called serial access
Direct/Random AccessDirect/Random Access Refers to the ability to
access data at random. In a random-access system, you can jump directly to file Z.
Disks are random access media, whereas tapes are sequential access media
Types Of AccessTypes Of Access
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Backing StorageBacking Storage Backing storage is used to save permanent
copies of your files onto. There are 3 main types
Magnetic These use magnetic fields to store the data
Floppy Disks/Hard Disk Drives Magnetic Tapes
Optical These store data by means of lasers ‘burning’ a disk
CDROM/DVD/Blue Ray Solid State
This uses no moving parts at all, uses memory chips USB Drives SSD Hard Drives
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Floppy DisksFloppy Disks Floppy Discs are small pieces of plastic film
wrapped in a plastic case, they are fast becoming very scarce due to their slow transfer speed and limited capacity, have basically been replaced with USB Flash Drives
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Type Of Access Direct/Random
Capacity 1.44 Megabytes
Portability Very – Only requires another drive
Transfer Rate Very Slow – 500Kbps
Price Approx 25p per Disk
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Hard Disk Drives (HDD’s)Hard Disk Drives (HDD’s) Hard Disk Drives are usually stored
inside the computer. They use disks of metal which are magnetically charged. These are read by a small head – like a
record player, which moves over the disks.
Nat 4/5
Type Of Access Direct/Random
Capacity Up to 3TB
Portability Not portable
Transfer Rate Up to 600Mbps
Price Approx £40 - £220
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Magnetic TapeMagnetic Tape Magnetic tapes are essentially the same
as music tapes. To access a file you have to sequentially go
through every file by fast forwarding or rewinding.
They are however relatively cheap and easy to store. Often used for backups
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Type Of Access Sequential
Capacity Up to 80GB
Portability Very portable, requires another drive
Transfer Rate Up to 7Mbps
Price Up to £20 per tape
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Optical Storage – Optical Storage – CD/DVDCD/DVD
CD and DVD’s are optical media – a laser is used to burn holes (pits) into the surface of the disk. CD/DVD-R are recordable once CD/DVD-RW are rewritable more than once
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Type Of Access Direct/Random
Capacity CD: 700MB (80 minutes audio)DVD 4.7GB up to 50GB Blue Ray
Portability Very portable, requires another drive
Transfer Rate Approx 130Mbps
Price CDR: 20-30p DVDR: 30p-£1
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USB Flash DrivesUSB Flash Drives USB (Universal Serial Bus) flash drives use
memory chips to store data, this means there are no moving parts at all – this is called solid state storage, this means they are very robust. These are often used in MP3 – Players – Ipod
Nano/Shuffle uses this. Some are even waterproof or branded with company
logos
Nat 4/5
Type Of Access Direct/Random
Capacity Up to 128GB
Portability Very portable, only requires USB port
Transfer Rate 10-30MBps
Price £10-£100+
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SummarySummary There are three main types of backing
storage Optical Magnetic Solid State
There are two main types of access Sequential Direct/Random
Input Devices put information INTO the computer
Output Devices get information FROM the computer