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