Storage Media and Devices

Primary Memory

Secondary Memory

Magnetic storage media

Optical storage media

Solid state storage

ROM ( Read Only memory)

RAM( Random Access Memory)

Has no moving parts

Fits into the computer directly

Cache

Use similar technology to RAM ad ROM, but this don't need electricity

They are small in size

They're portable

Can store large amount of data

Can be used for backup

Examples:

Memory sticks/ pen drives

Flash memory card

Pen drive is another name for memory stick

are similar to memory sticks

has lots of storage

can be used for backup of main files

small,light and portable

has non volatile memort

lifespan is limited

can be used in different type of devices

*can be lost easily

surface of it is made of magnetic material

data written by changing magnetic polarity to represent 1 or 0

Holds data magnetically

the pits represents 1s and 0s

Examples:

magnetic tape drives and tapes

Portable & Removable hard disks

similar to data storage in disks

data is stored on a long line on the tape

device that drives the tape around the read/write heads

the read/write head stays still and the tape move past it

data is at the end of the far end, so it takes time to get there

Serial storage

Sequential storage

data is arranged randomly, it will be stored one after another.

Data are arranged in order

Takes time to load

Files load faster

fixed hard disks and drives

similar to fixed hard drives, but they're not connected inside the computers

can be easily connected to computer

are portable so they can be taken anywhere

does not require power source

can be used for file sharing/ transferring files

main storage on pc

data stored on one or more disks

hard disk is fixed into the drive inside the computer

each disk has a read/write head

fast access to data

can store large amount of data

Examples:

stores data on the surface using 'pits' burnt by laser

CD

DVD

Blu ray

hold large files but is limited in storage

can hold more file than CD

CD ROM

CD R

DVD ROM

DVD R

DVD RAM

have large storage capacity

high definition videos

a reserved storage location

temporary data that help: websites, browsers, and apps to load faster

easy to quickly retrieve data

Type of primary storage that can be accessed anytime

read data to run applications

volatile memory

non volatile memory

stores system required

type of primary memory that cant be changed easily

needs power source to run data

it only allows reading