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1.3.5 Memory, storage devices and media (CS2) : - Coggle Diagram
1.3.5 Memory, storage devices and media
(CS2)
:
Memory
retaining, retrieving data/information
programs
files
instructions
files
documents
music files
pictures
video & audio
Every piece of data/information needs a storage
primary storage
secondary storage
off-line storage
Primary storage
currently processed data/instruction
RAM
volatile memory
temporary storage
RandomAccess Memory
limited capacity (8gb, 32 gb)
Cache memory
frequently used instructions and data
fastest memory
inside the cpu
expensive
small capacity (2mb-8mb)
volatile
temporary
ROM
non-volatile memory
permanent
Read Only Memory
CPU HAS DIRECT ACCESS
Secondary storage
is accessed by the CPU indirectly
non-volatile
permanent
hdd-magnetic drives/disks
has magnetic spinning disks
consumes more power
very large capacity / lower prices
not durable, collisions are fatal
ideal back-up
cheaper
slower
ssd electronic components (logic gates)
data stored in chips (electronic components)
chips require less power
expensive
physical sizes are same or smaller
faster
durable
large capacities (1 tb-4 tb)
Off-line storage
outside the computer
cd-rom 700mb
dvd-rom 4.7 gb
blue-ray 8gb-30gb
micro-sd cards
usb disks
flash disk
external hdd/ssd