2. What is Memory?
What is Storage?
Difference between Memory and Storage.
Types of Storage Devices.
Advantages and Applications.
Conclusion.
References.
3. • Memory is usually designed to store and retrieve data
in word-length quantities. It is always based upon the
semi conductor technology.
• Memory unit is called Random Access
Memory(RAM).If any location can be accessed for a
Read or Write operation in some fixed amount of time
that is independent of the location address.
4. A storage device is any computing Hardware that is used
for storing, porting and extracting data files and objects.
Storage is typically non-volatile in nature, means that it
retains its state even when the power is off.
5. The term Memory refers
to the amount of RAM
installed in the
computer.
Any data held in
Memory is lost when the
computer is turned off.
Ex:Desk
The term Storage refers
to the capacity of the
computer’s hard disk.
The information Stored
on a hard disk remains
intact even when the
computer is turned off.
Ex:File cabinet.
6. Primary storage: is the storage provided
by memory in a computer system
e.g. ROM/RAM
Secondary storage: is storage provided
by peripheral devices other than memory
e.g. Hard Disk, Floppy Disk, Magnetic tapes etc.
8. Dynamic RAM : loses its stored information in a very
short time (for milli sec.) even when power supply is
on. D-RAM’s are cheaper & lower.
Similar to a microprocessor chip is an Integrated
Circuit (IC) made of millions of transistors and
capacitors.
9. A type of RAM that is quicker than dynamic RAM and
does not need to be refreshed. Because it is more
expensive and holds less data than dynamic RAM, it is
used primarily for cache memory.
10. PROM is programmable ROM. Sometimes we may
want to write some data on the ROM. In such cases we
use PROM. Data can be written on it using special
equipment.
Prom is important to note that data can be written on
PROM only once but it cannot be removed from the
PROM.
11. EPROM is programmable ROM from which data can
be programmed and erased. Note that programming
and erasing is not limited to just one time.
EPROM is now used in most bios systems.
This provides flexibility for the programmer.
12. EEPROM is the next generation of ROM. It takes
EPROM to the next level. As compared to EPROM,
EEPROM can be programmed using software
technology.
The main advantage of this is you don't need special
hardware to program it.
13. Two main categories of storage technology used today are magnetic
storage and optical storage
Magnetic Storage Devices
1.Hard Disk(Fixed and Portable)
2.Floppy Disk
3.Magnetic Tapes
4.Flash Memory
Optical Storage Devices
1.Compact Disk(CD)
2.Digital V Disk(DVD)
14. A hard disk drive is the device
used to store large amounts of
digital information in computers
and related equipment like iPods
and games consoles such as the
Xbox 360 and PS3.
Hard disk drives are used to store
operating systems, software and
working data
.
15. Portable hard discs are good fun
because you can carry data about all
over the place and transfer
information, programs, pictures, etc
between computers.
16. A floppy disk is a data storage
medium that is composed of a disk
of thin, flexible floppy)magnetic
storage medium encased in a
square or rectangular plastic shell.
Floppy disks are read and written
by a floppy disk drive
17. Magnetic tape has been used for data
storage for over 50 years. When
storing large amounts of data, tape can
be substantially less expensive than
disk or other data storage options.
Tape storage has always been used
with large computer systems.
18. • Nearly all computers today include a CD or DVD drive,
usually located on the front of the system unit. CD
drives use lasers to read (retrieve) data from a CD.
• Many CD drives can also write (record) data onto CDs.
If you have a recordable disk drive, you can store copies
of your files on blank CDs. You can also use a CD drive
to play music CDs on your computer.
• DVD drives can do everything that CD drives can, plus
read DVDs.
19. . If you have a DVD drive, you can watch movies on
your computer or play music CDs. Many DVD drives
can record data onto blank DVDs.
20. Flash memory cards store computer information such
as text, pictures, and music. You can erase and reuse
memory cards over and over. Most digital cameras
store pictures and video on a CompactFlash memory
card or a Secure Digital (SD) card.
21. Advantages:
Greatly improved data cargo carrying capacity (relative
to the 1.44 Mb floppy disc).
You don't need to worry about the other person having
the same type of special cartridge drive as yourself.
Disadvantages:
Hard drives have to be handled quite carefully, and
when being transported should be wrapped in
something soft and put in a padded bag.
More expensive than other forms of removable media.
