1.1 Computer Hardware
, Input Devices Output Devices Biometric Devices
A biometric device uses a
human characteristic as
part of its security
mechanism
e.g. fingerprint, iris, face or
An input device allows data An output device is created voice.
to be entered into a by a computer system.
computer system.
Organisations use
e.g. text, images, video or Devices: biometrics.
sound, MUST instruct each
1. Printer employee to =
Devices: 2. Speakers 1. First input information
3. Monitor to a database
1. Mouse 4. Headphones 2. Scanned = searches
2. Keyboard 5. Projector in its database to see
3. Controller 6. Alarm if fingerprint matches
4. Sensors 7. Light one it already holds
5. Scanner 3. Only authorised
employees with a
match can access
, Advantages Disadvantages
Security is improved, as biometrics can’t Can be expensive to install, and all users
be shared, like passwords must take the time initially set up,
by entering their biometric into the
database, so they can be recognised by
If passwords are exposed, the system can’t the system.
be accessed without having the biometric
Unreliable , in that it can be affected by the
Biometric scanners verify that a user is environment (e.g. dirty fingers cannot be
who they claim to be used with a scanner or in a loud area voice
recognition may not work)
Might be quicker and easier than a
username & password. Disabled users might not be able to
provide the biometric required
Privacy concerns: users might not want
personal characteristics stored on a
system
,1.2 Computer Components
, Memory
Memory is split into two types
=
1. Volatile storage
2. Non - Volatile storage
, Volatile Storage Non-Volatile Storage
Is temporary Saves the data
Data is lost whenever the Even when not being powered
power is turned off.
So it can be accessed when
the computer is next on
Can be stored long-term
lost
saved
, Processor Motherboard Power Supply Unit
A processor’s Main Role is A Motherboard is the = Converts electricity from
to = AC from the main power
Main circuit board of a supply
Manage the functions of a computer which to DC
computer system components Which the computer system
can use.
By processing data & e.g. CPU & ROM are
instructions connected AC: Alternative
DC: Direct Current
Contains PCI slots for:
- PSU of desktop is
Primary Processor: 1. expansion cards internal
Central Processing Unit 2. and ports - Portable device
(CPU) 3. for external devices. require external
charger
, Random Access Memory
Read - Only Memory (ROM) Cache Memory
(RAM)
RAM = Volatile storage ROM = Non - volatile storage CM = Volatile
storage
That stores all programs that are That cannot be changed.
currently running. That stores data
Stores: that's-
Also stores parts, of the boot program / BIOS for frequently accessed
operating system to be when the computer is switched
accessed by the CPU on
Quick to access
Because it's closer
RAM made up of LARGE - BIOS then loads up the to the CPU
number of storage locations = operating system
- each identified by a - to take over managing Than other types of
unique address. the computer. memory e.g. RAM
, Input Devices Output Devices Biometric Devices
A biometric device uses a
human characteristic as
part of its security
mechanism
e.g. fingerprint, iris, face or
An input device allows data An output device is created voice.
to be entered into a by a computer system.
computer system.
Organisations use
e.g. text, images, video or Devices: biometrics.
sound, MUST instruct each
1. Printer employee to =
Devices: 2. Speakers 1. First input information
3. Monitor to a database
1. Mouse 4. Headphones 2. Scanned = searches
2. Keyboard 5. Projector in its database to see
3. Controller 6. Alarm if fingerprint matches
4. Sensors 7. Light one it already holds
5. Scanner 3. Only authorised
employees with a
match can access
, Advantages Disadvantages
Security is improved, as biometrics can’t Can be expensive to install, and all users
be shared, like passwords must take the time initially set up,
by entering their biometric into the
database, so they can be recognised by
If passwords are exposed, the system can’t the system.
be accessed without having the biometric
Unreliable , in that it can be affected by the
Biometric scanners verify that a user is environment (e.g. dirty fingers cannot be
who they claim to be used with a scanner or in a loud area voice
recognition may not work)
Might be quicker and easier than a
username & password. Disabled users might not be able to
provide the biometric required
Privacy concerns: users might not want
personal characteristics stored on a
system
,1.2 Computer Components
, Memory
Memory is split into two types
=
1. Volatile storage
2. Non - Volatile storage
, Volatile Storage Non-Volatile Storage
Is temporary Saves the data
Data is lost whenever the Even when not being powered
power is turned off.
So it can be accessed when
the computer is next on
Can be stored long-term
lost
saved
, Processor Motherboard Power Supply Unit
A processor’s Main Role is A Motherboard is the = Converts electricity from
to = AC from the main power
Main circuit board of a supply
Manage the functions of a computer which to DC
computer system components Which the computer system
can use.
By processing data & e.g. CPU & ROM are
instructions connected AC: Alternative
DC: Direct Current
Contains PCI slots for:
- PSU of desktop is
Primary Processor: 1. expansion cards internal
Central Processing Unit 2. and ports - Portable device
(CPU) 3. for external devices. require external
charger
, Random Access Memory
Read - Only Memory (ROM) Cache Memory
(RAM)
RAM = Volatile storage ROM = Non - volatile storage CM = Volatile
storage
That stores all programs that are That cannot be changed.
currently running. That stores data
Stores: that's-
Also stores parts, of the boot program / BIOS for frequently accessed
operating system to be when the computer is switched
accessed by the CPU on
Quick to access
Because it's closer
RAM made up of LARGE - BIOS then loads up the to the CPU
number of storage locations = operating system
- each identified by a - to take over managing Than other types of
unique address. the computer. memory e.g. RAM
