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Year 10 compting (magnetic disks (hdd (drive head (makes slower, wear down…
Year 10 compting
magnetic disks
magnets
0s 1s
very tightly packed
hdd
very high capacity
drive head
makes slower
wear down over time
tapes
extremely large capacity
off site backup
data capacity
magnetic
solid state
optical
lesson idea
see how much of each doc can be stored on media
e.g.
vids on HDD
pics on optical disks
get children to calculate
solid state
small
lightweight
access quickly
oxide layer
electrons passed
causes
0
1
all 1s when you buy
changed to 0s
program
write data
change 10110110
to 11001001
convert to 11111111
scenario
dash cam
medium storage
quickly get data on off
stotred quicly
portable
durable
reliable
desktop office
high storage
no portability
durability
distributing video game
optical media
portable
installed on console
lowcost
cloud
speech
tertiary storage
backups
archives
magnetic tape and store in a safe
optical disks
shine light on it
data burnt onto disk
pits and lands
suitability of storage
optical
read only
good
game consoles
where HD limited
distribution
large-scale
magnetic
high capacity
fast access
low cost
server farms
solid state
lowpower
portable
small medium
silent operation
very fast access
flash
reliable
expensive
cheapernow 500 gb £80
pcs split
ssd holding os
more reliable
secondary storage
based on craig n dave
slide 1 primary
slide 2 secondary storage
devices
magentic disk
solid state devices
optical devices
silent starrter
5mins
what is RAM/ROM
limitations of RAM/ROM
store data long term
pages 11-14
1000 gb in one tb
fit into storage device