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Computer Systems
Computer Systems
Input Devices
Input Devices
Input Devices
Input Devices
Input Devices
Input Devices
Input Devices
Input Devices
Input Devices
Input Devices
Input Devices
Input Devices
Input Devices
Input Devices
Input Devices
Input Devices
Output Devices
Output Devices
Output Devices
Output Devices
Output Devices
Output Devices
Output Devices
Output Devices
Output Devices
Output Devices
Output Devices
Output Devices
Output Devices
Output Devices
Floppy Disks
Floppy Disks
Floppy Disks
Floppy Disks
Hard Disk Drives (HDD’s)
Hard Disk Drives (HDD’s)
Magnetic Tape
Magnetic Tape
Optical Storage – CD/DVD
Optical Storage – CD/DVD
Optical Storage – CD/DVD
Optical Storage – CD/DVD
Optical Storage – CD/DVD
Optical Storage – CD/DVD
USB Flash Drives
USB Flash Drives
USB Flash Drives
USB Flash Drives
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Computer Systems

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1Computer Systems. Nat 4/5 Computing 10and limited capacity, have basically been
Science Input, Output and Backing Storage. replaced with USB Flash Drives. Nat 4/5.
2Lesson Aims. By the end of this Type Of Access. Direct/Random. Capacity.
lesson: Pupils will be able to: Describe 1.44 Megabytes. Portability. Very – Only
the features, functions and uses of: requires another drive. Transfer Rate.
keyboard, mouse, microphone, touchpad, Very Slow – 500Kbps. Price. Approx 25p per
digital camera, scanner, webcam Describe Disk.
the features, functions and uses of 11Hard Disk Drives (HDD’s). Hard Disk
monitor, LCD panel, inkjet and laser Drives are usually stored inside the
printers, loudspeakers Compare devices computer. They use disks of metal which
using appropriate characteristics are magnetically charged. These are read
including resolution, capacity, speed of by a small head – like a record player,
data transfer, cost. which moves over the disks. Nat 4/5. Type
3Input Devices. An input device is a Of Access. Direct/Random. Capacity. Up to
device which creates some new information 3TB. Portability. Not portable. Transfer
to put INTO the system. Nat 4/5. Rate. Up to 600Mbps. Price. Approx ?40 -
4Output Devices. An output device is a ?220.
device which gets information FROM the 12Magnetic Tape. Magnetic tapes are
system. Nat 4/5. essentially the same as music tapes. To
5Input/output Devices. You have to be access a file you have to sequentially go
able to compare these devices in terms of through every file by fast forwarding or
appropriate characteristics such as: rewinding. They are however relatively
Resolution Capacity Speed of data transfer cheap and easy to store. Often used for
Cost. Nat 4/5. backups. Nat 4/5. Type Of Access.
6Backing Storage. Sequential. Capacity. Up to 80GB.
7Storage Terms. BIGGER -> BIGGER Portability. Very portable, requires
-> BIGGER -> BIGGER -> BIGGER another drive. Transfer Rate. Up to 7Mbps.
-> BIGGER -> Nat 4/5. Term. Price. Up to ?20 per tape.
Abbreviation. Description. Bit. binary 13Optical Storage – CD/DVD. CD and DVD’s
digit, 0 or 1. Byte. a group of 8 bits – are optical media – a laser is used to
Single Letter. Kilobyte. Kb. 1024 bytes. burn holes (pits) into the surface of the
Megabyte. Mb. 1024 Kilobytes. Gigabyte. disk. CD/DVD-R are recordable once
Gb. 1024 Megabytes. Terabyte. Tb. 1024 CD/DVD-RW are rewritable more than once.
Gigabytes. Nat 4/5. Type Of Access. Direct/Random.
8Types Of Access. Sequential Access. Capacity. CD: 700MB (80 minutes audio) DVD
Direct/Random Access. To go from file A to 4.7GB up to 50GB Blue Ray. Portability.
file Z in a sequential-access system, you Very portable, requires another drive.
must pass through all files in order. Transfer Rate. Approx 130Mbps. Price. CDR:
Sequential access is sometimes called 20-30p DVDR: 30p-?1.
serial access. Refers to the ability to 14USB Flash Drives. USB (Universal
access data at random. In a random-access Serial Bus) flash drives use memory chips
system, you can jump directly to file Z. to store data, this means there are no
Disks are random access media, whereas moving parts at all – this is called solid
tapes are sequential access media. Nat state storage, this means they are very
4/5. robust. These are often used in MP3 –
9Backing Storage. Backing storage is Players – Ipod Nano/Shuffle uses this.
used to save permanent copies of your Some are even waterproof or branded with
files onto. There are 3 main types company logos. Nat 4/5. Type Of Access.
Magnetic These use magnetic fields to Direct/Random. Capacity. Up to 128GB.
store the data Floppy Disks/Hard Disk Portability. Very portable, only requires
Drives Magnetic Tapes Optical These store USB port. Transfer Rate. 10-30MBps. Price.
data by means of lasers ‘burning’ a disk ?10-?100+.
CDROM/DVD/Blue Ray Solid State This uses 15Summary. There are three main types of
no moving parts at all, uses memory chips backing storage Optical Magnetic Solid
USB Drives SSD Hard Drives. Nat 4/5. State There are two main types of access
10Floppy Disks. Floppy Discs are small Sequential Direct/Random Input Devices put
pieces of plastic film wrapped in a information INTO the computer Output
plastic case, they are fast becoming very Devices get information FROM the computer.
scarce due to their slow transfer speed
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Computer Systems

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