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secondary storage - Coggle Diagram
secondary storage
magnetic disks
contains coecentric circles called tracks
track is dvided into sectors
disk head is mounted on mechanical arms
solid disk is called a hard disk and a soft one is called a floppy disk
parts of a hard disk
magnetic platter
contains data
drive spindle which rotates
drive read/write data on drive using electromagnet
actuator
moves arm
large storage capacity
cheap
advantages
cheap
large storage capacities
fast write speed
disadvantages
lots of mechanical parts
low durability
sealed unit
not portable
solid state drives
non volatile memory
very fast write speeds
no mechanical or moving parts
advantages
durable
very fast write speed
fast start up times
disadvantages
storage types
optical
link to coggle.it
magnetic
solid state
flash memory
optical storage
data is stored as pits and lands
its scanned by a laser beam
advantages
cheap, portable, takes little space
disadvantages
low storage capacity
easily damaged
slow write speed
flash memory
advantages
durable
low cost
no moving parts
flash memory types
NOR flash memory
used for programs
NAND flash memory
data storage