C&D A-Level
Operating system
types
multi user
windowns
windows nt
distributed
embedded
systems
dedicated OS
real time
aircarft
self drive car
click to edit
storage
secondary
magnetic
optical
solid state
use magnetic field
types
hdd
floppy
tape
read write head
nanometers
1/1000th mm
can be used in data centres
shine
laser
reads
land 1
pit 0
stored when power lost
data
to blocks on chip
read
written
flash
read/written
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no moving parts
Primary
RAM
ROM
holds
os
programs
data used for programs
volatile
retains info
power off
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BIOS(Basic Input Output System)
power on self test
hardware
setup
working
goes through drives
get
OS
boot strap
kernel
hand control to OS
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click to edit
plastic
bumps burned on plastic
alluminium layer
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starts center
spirals out
1/2 micromter wide
spinning disks
reader
magnets
metal grains
grouped together store data
this is coverted from bits
each graiin bit
direction
determines
0
1
click to edit
to read it has magnetic reader
usefull string
0110011
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store