its just a simple presentation about our chapter 3 data storage

2. CONTENT
Data storage
Comparison between RAM and Backing Storage
Device
Backing up Data
Ways of storing and reading Data
Storage Media
Magnetic storage media
Optical storage media
Solid state storage media

3. Data storage is
where we put data in
a known place which
we can come back to
later and get the
data back again.
Data can be
temporary or
permanent.
Any data storage
device; that stores
or reads data from
any medium, including
the medium itself.

4. RANDOM ACCESS MEMORY
Commonly known as RAM
Used to store data temporarily
Very fast reading/writing of data
Stores data that are currently in use
Volatile memory

5. BACKING STORAGE DEVICE
Data is
permanently
stored
Non-
Volatile
memory
Used to
store data for
a long term.
Slower
reading/writi
ng of data

6. BACKING UP DATA
Backing up is the process of making copies of your files.
It prevents us from losing our work and files.
Backups should be stored in a different location from
the original.
To back up data we need :
Storage device: writes or reads data from storage
medium
Storage medium: hardware that holds the data

7. Some of the reasons why we backup data are:
Data can be accidently copied over or
deleted
Data can be lost due to damage to the
device
Hackers could delete our files
Storage device can be destroyed
Storage device can be lost

8. WAYS OF STORING AND
READING DATA
Serial access Direct access
Sequential Access Random Access
Very slow method of accessing data We can access the data quickly
To find the data we have to search
from first in the sequence
Data has been stored and can
straightly go to the data
Used in old magnetic tapes and
batch processing systems.
Used in Hard disk drives,CDs and
DVDs
Ex: Music cassettes, Video cassettes,
Backup tape catridges
Ex:USB memory sticks, Flash
memory,Blu-ray discs

9. STORAGE MEDIA

10. MAGNETIC STORAGE MEDIA
Magnetic media holds data magnetically.
The surface area of the media are magnetized so that they can hold bits of
data.
The device that reads the media can also read the bits held on the surface
area.
It uses a magnetic surface area in order to hold bits of information.

11. OPTICAL STORAGE MEDIA
All the mediums the use a light source to
write/read data onto a disc is known as
optical media.
Data is read by shining the laser beam onto
the disc.
It holds data by burning dots onto the
surface with a high powered laser.
It stores data on a disc as a number of data
dots that can be read using light.

12. SOLID STATE STORAGE
MEDIA
It is also known as flash memory.
It is the smallest form of data storage.
They are very small and robust.
They use less power and provides us with
faster data transfer and access times.
Any memory device based on electric
circuits.
Any memory device that has no moving
parts.