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computer science (flash (permeanant storage (portable devices), non…
computer science
flash
non-volatile
read/write
BIOS
permeanant storage
portable devices
secondary storage
h/drive
cd rom
for
backup
3 types of storage
optical
cd
cd rw/w
DVD r
DVD rw
blu ray
how work
shine light
read reflection
read spiral
from centre out
very slow
binary code
write to it
laser burns
magnetic disks
magnetic principles
N/S
head
reads over
tape
read write
sequential
v.slow
used
backup
archive
replaced
solid state
SD card
mem sticks
how
flow electrons between
two oxide layers
floating gate
charge changes
0
1
suitable storage