Optical disk and memory storage devices Chapter - 12 (LIC ; SBI ; IBPS

hello friends welcome to current affairs
under free education revolution so today
our topic is optical disk and memory
storage devices so we already done the
mechanism of optical is in our previous
lecture if anyone haven't seen my
previous lectures so please go through
on this pre my previous lecture after
that please watch this one the last
storage device topic part 3 topic ok so
now I am going to start in previous
lecture we have already done the
mechanism of optical disk what is the
mechanism used in optical disk here to
read or write we use the optical disc
drive use a laser beam technique ok so
now here we came the categories or you
can say the CDs or devices which come in
optical discs now we are going to all of
them to see which are the optical disc
devices first of all first device which
come in optical disc is cd-rom okay what
is the meaning of cd-rom CD means
compact disc and Romneys read-only
memory as the name suggests read-only
memory it means that this one this is
only read on read on purpose okay you
cannot write anything on it so whatever
the data is in this disk you can see in
the picture this kind of series called a
CD row okay and whatever the data is
stole here is written by the
manufacturer which will sell to you okay
but the data other data you cannot write
on this so the whatever the data units
is the permanent
that one data is already fed by the
manufacturer you cannot enter any data
on this CD now we are going to learn
about it first point stand for compact
disk read-only memory so I already told
you that what is the full form of cd-rom
is compact disk read-only memory now
going to second point packaged as
shining means this is look shiny in the
picture also silver color it is in
silver color metal disk metal disk and
fire now 1/4 inch or you can say 12
centimeter diameter okay so what is the
standard size of the CD ROM is 5 and a
1/4 inch and or you can say 12
centimeter please people please friend
go through my all point because using
all this point your mcq will be made
okay in your paper in your cutting paper
so please follow me go through my these
points maybe the portion can become that
the what is the standard size of your
cd-rom then what will be your answer it
will be 12 centimeter or if your answer
is in inches then you will select the 5
and a 1/4 inch okay and having a storage
capacity what is the storage capacity at
least about 6 fine a 650 megabyte or you
can say 600 650 m be okay now come to
our next point disk are pre-recorded I
already told you that this cut
pre-recorded you cannot record anything
on a and the information is stored on
the and the information is stored on
them cannot be order you cannot alter
anything on this CD room ok now going to
our next point which is a single
see dear oh this can hold a complete
encyclopedia because it has a largest
storage space so it can hold our
complete encyclopedia or our destiny
okay or a dictionary or our word Atlas
means maps words maps or a biography of
great people etc means it can hold a
very large amount of data now the next
point used for distribution of
electronic version of conference
proceedings
okay whatever the consonance is going
you can record it as in in your CD and
then it you can pass on to other people
to see that will cause conferences okay
and journals for general purpose means
you've published any journal then you
record it on your CD room and then
publish your journals magazines you can
record the data of magazines books and
multimedia application
what is the multimedia application it
can be any video it can be an audio okay
such as video games okay your video
games if you play video games and you
know that your video games also came in
a CD room okay in your video CD or a
room or is a video game CD you cannot
write anything on it okay it is a CD
room okay but ever the data on it you
can only use it but you cannot write or
you cannot alter any data which is a
store on your CD okay
that kind of CD called CD room next
point used by software vendor this CD
used by wagyu a software vendor or
vendors who made software will record
data on it and with sold or distribute
to you okay distribute for distribution
of software to their customer so this is
the characteristics of CD ropes now we
came to our next type of optical disk
which is called warm ok
see the what is the meaning of warm
right was what is the meaning W right
once and read many times what does it
mean that you can write only once but
you can read it many times but ever the
data you write on it it will be only one
first time okay so these kind of since
CDs you can purchase in only ten to
fifteen rupees and you can enter any
data recorder anything on it but it will
be permanent forever
you cannot order anything on it this
kind of series called warm means you
write was you only write it on verse and
then after that you can read it it
anytime after that it will go right like
a CD room that is what it is called why
it is for Syria what is when contact
this deed okay but you can write on it
but only for first one time okay
remember this what is the meaning of one
okay now we goes through the points of
rawa strengths or right was mean you can
write once read many time data can be
returns only once on them means you can
write data only once on that but can we
read many times but you can read the
data which is stored on it it many time
okay now you go into next point same as
cd-rom it vocalize a CD rule but the
only difference is that you can write
only one time okay and has same storage
capacity is the storage capacity
capacity is also same as your cd-rom
which is 650 MB 650 MV is the capacity
of your cd-rom and it is also the
capacity of your
cedia okay information at least it this
is the at least capacity okay now more
capacity series are now coming on the
market so this is less now you can say
that at least this storage kappa
we'll be in the c d---rom or your CDR
okay information recorded on them can be
read by any ordinary cd-rom drive but
means you can insert your CDs are in any
CD room trend and you can read the
recorded data which is stored on it
many times now going to the next point
and our user to create their own means
user can create their own CD row this by
using CD recordable CD recordable dry
that can be attached to a computer as a
regular peripheral devices ok means you
CD drive will be attached to your
computer or your laptop and then you
insert a CDR into that right and you can
record anything any data on it and then
it will work like as a serum okay now
going to our next point they are used
for data archiving where it can be used
for achieving for backup ok and for
making a permanent record if you want to
make your data permanent that you will
where you will restore it it if you will
store it in the forum ticket for example
many bank use for use there for
restoring their daily transaction means
whatever the transaction our bank do
where it will be stored they will strong
in a CD are now going to our next
optical disc drive eyes which is CD read
or write ok what is me CD means contact
this read or write ok means you can
write it on many times and read it on
many times ok this is the next version
of your optical disk so now we are going
to them look their point same as CDR and
has same storage capacity it also has a
same storage capacity ok next point
allow user to create their OCD room just
by using a CD recordable means you can
use the CDR drive and record on it that
can be attached to a computer as a rag
preparing for a device next point data
to be recorded can be returned on its
surface whatever the data you will
record where it will be written it will
be record in its surface in multiple
recording means you can you can write
anything in on it in a multiple
recording session okay keep on in mind
that you can record multiple times okay
in where cg0 fried now going to the next
point can be erased and written afresh
okay you can read or sorry you can read
NS or erased a data on it whatever the
data is too long you can raise it okay
and then right again on it this is
possible in where CDs Eid or right now
we are going to the next optical device
which is called digital video once a
time dis okay what is the meaning or DVD
dis these four DS eaters v4 video or you
can call is a versatile D for again disc
okay this is a video disc or you can
call it digital versatile disc so now
going to their points here you can see
the picture of DVD it is also look like
a CD but there are some differences in
DVD what is the point
look same as a CD room it is look like a
sale you know but has a capacity of 4.7
gb means its capacity is very much
higher your cd-rom schemes in MD but
your DVD comes in GV it is come 4.7 gb
or 8.50 it now it's all going to be
greater and greater in size our
technology is working on it
design cream primarily to store and
distribute movies first of all when he
this one design DVD is designed then
where it is used to distribute movies
okay
whatever the movie you write on it and
then distribute that one okay and next
point can be used for a storage of large
data a data which is using size and
and you can use your DVD here because it
has a greater capacity for storing okay
now we came here for the advantages of
optical DS which other advantages of the
optical discs here we goes first of all
the cost per bit cause permit I've
already told you whatever the cost of
your disk and what is the custom edge
capacity you just need to divide your
storage capacity in bit suppose it can
store 1000 bits and how much is a cost
suppose it has a question is hundred
then what is the cost per bit is 10
rupees per bit okay this is the cost per
bit of the storage for optical disk is
very low okay because you know if ever
if you ever purchase any cd-rom CD are
anything then you can know that this
cost per bit is very low because it
comes in a very cheap price because of
their low cost and a nominal data store
it means it can store are very anomalous
yani use storage density okay now we get
now coming to of the next point which is
the use of a single spiral trick we I
already told you what is the mechanism
that it is like that that your CD like
that it has a single storage track okay
and here the data start writing on it
and like that okay so it has a single
Hughes single track spiral track make
optical disks as an ideal storage medium
for reading large block of a sequential
data I already told you that it comes in
a direct storage a data a devices but it
is a sequential because the data write
on it in a sequential way my to read or
write anything on it is
very fracture of time so you never ever
realize that it was like a sequential
but in reality it is work like a
sequencer
but it's working speed is very is
storing or it's reading speed is so high
so you think like that it is comes in a
direct students ways but it is not a
data storage is it is a sequential
storage device okay sequentially
accessing you data is xsr data in a
sequential way okay so here the
advantage that the use of a single
sporadic Mac track mix optical disk and
idleness storage media for reading large
crop of sequential data such as music
you I already told you that it whatever
the music in all your first block or if
a any day your song is on your 100 and
our fifth position it will take some
time but it not a very fuse time but it
will take a dime around some seconds 10
seconds or 50 seconds but it will take
at time to reach that pin position okay
why so because it will work in a
sequential manner okay sequential access
manner now next point optical disc drive
do not have any mechanical read or write
head means like your magnetic disk there
is a raid and island but in your optical
disk there is on no mechanism which used
read or write head why so because it use
a laser beam technique by using laser
beam technique it will write anything on
it and it will read anything any data
which is store on your optical disk so
here is it that it will not use
mechanical read or write head to drop
against or crash into the disk surface
nothing is dub on it this make optical
disks are more reliable your optical
distance more readable storage medium
then magnetic tape or magnetic disk I
saw in magnitude tip and
when you do this there is a read or
write head using this one read or write
act you will write or read any theta
from your disk or tape right here in
optical disk this is not a procedure
here
laser beam technique use okay now came
to our next point optical disk have a
large storage light in excess of thirty
years means it is not going to damage in
a very small time okay it will if you
keep it in a securely or you can say
enough safe place you will not scratch
it so much time many times so it will be
in a good condition around excess of
thirty years maybe it will going to be
safe above the thirty years also k so
this makes them a batter so this will
make them a battery storage medium for
data archiving as compared to magnetic
tapes or magnetic disk okay now going to
the next point as data was stored on an
optical disk become permanent whatever
the daughter you record on it most of in
the disk only if you will exclude the CD
read or write device excluding that
fundus most of the data whatever you
write on it it will be permanent forever
ok so the data was the data stored on it
will become permanent danger of stored
data danger of store data getting in
advertently erased or overwritten is
removed means the data which you write
on your disk will not be erased so
easily okay accidentally because it is
become permanent when you record on it
okay due to their compact size because
your CD comes in a compact size and
light weight it is a lightweight optical
discs are easy to handle means you can
easily handle it you can keep it in
your paws in your back and take it to it
another place very easily okay store
them and put them from one place to
another okay so it is very easy because
your CD CD disc is CD tray and sorry
cd-rom or CD drive
sorry CD room and DVDs comes in a very
small size small size compact weight
okay so this is the advantages next
advantage music CDs can be played on a
computer having a cd-rom drive alone
with a soundboard means if you attach
the soundboard and a speaker than your
musics your computer become a music
system okay because anything data you
can store on your CD room so you can
also store a music of movie on it and
then you played and your system become a
music system okay this allow computer
system to be also used as a music system
your computer become as a uses system
now going to the limitation what are the
limitations are optical discs first of
all it is largely read-only memory okay
once you write on it very rarely you can
erased on it excluding CD R and W okay
where you can write and read many times
excluding on read that one type of
optical disk most of the data which ever
you stored on it become permanent so the
data was recorded cannot be erased and
hence the optical disk cannot be use
reused - so you cannot reuse your
optical disk again and again because you
once write on it
you cannot arrest a data from that your
disk now came to the next limitation the
data X is a speed to access the data
from your optical disk is slower than
magnitude is I already told you that in
your
Netta days comes in direct access
sequencer directs access and your
optical disc comes in also direct access
but the processor procedure which is
follow it is a sequential access okay so
those two access the data from optical
disk is much slower than a magnetitis
okay this is the limitation next optical
discs require a complicated drive
mechanism via so I already told you that
if user loose laser beam technique so
the mechanism which is he used to read a
data or write a data from your optical
disk is a typically complicated
mechanism okay now going to the uses
where we can use our optical disk first
of all for distributing a large amount
of data at low low cost if you want to
you have a very large amount of data and
you want to distribute to many people so
where you can store you can store not
turn on your CD Drive LCD and you can
distribute it because it will cost are
low okay what will cost if we caused a
low cost now come to our next point what
is the next point for distribution of
electronic version of conference
proceeding journals magazines books
project catalog etc there you can use to
distribute any electronic version any
bags in books etc where you can use your
optical disk and then third point for
distribution of new or upgraded version
of software product by software vendor
so your software vendor also uses
optical disk to distribute their
software
among people for our chipping of data so
if you want to back up our arch of your
data you can store data on your optical
disk because it has a greater storage
capacity which are not used frequently
but which may be used once in our wire
means
you can use it once in a while sometimes
you need that one data so you can store
it on your optical disk now came to the
next point next one is warm days are
often used by end user companies to make
permanent storage of their own property
information means these are used by some
end user means if I want to sell you my
videos so where I will store I will is
Tori not warm once recorded once try it
on it and write once and read many times
means I recorded my rate of only once
and you will see my recorded data video
many times so where I will is to order
it warm okay so in warm this warmth is
also used where where and user company's
store on it permanent historic to make
it permanent and then after that they
will distribute to people's okay now we
came to over next week all I already
learn about hard is optical disk
magnetic disk magnetic tapes okay now we
came to the next and our last devices
which called memory storage devices ok
memory storage devices there is a flash
drive which is also called up and right
so you never be cured
please don't get confused whenever flash
drive is use you will understand that it
I am talking about you up and drive and
drive your people use pendrive okay is
through like that
so now going to their points relatively
new second restore notifies it is unused
reintroduce a can destroy a device based
on flash memory enabling easy transport
of data means you can easily transport
your data from one computer to and
either computer okay now going to the
next point
compact devices of the size of a pen
okay
compare device of the size of a pam
comes in our various shapes and style
design and may have different edit
features means your pan rice comes in
our various shapes is Charles and they
have a same air so many features depends
up on whatever the pendrive you are
going to purchase okay next point plug
and play means just you plug it and play
whatever the data stored on your device
okay so this one device is called up
plug and play device okay you just plug
it in your computer in your laptop and
just data whatever I student going to be
play so it is for plug and play device
that simply plug into a USB okay what is
the meaning of USB Universal Serial bus
port of a computer treated as a
removable Rai means you can remove that
one drive okay available storage
capacities are 8 MB 16 MB 64 MB 128 MB
256 MB 512 MB 1 GB 2gb 4gb and 8 GB etc
now is going to be more and more in size
ok storage space is going to be
increased
okay now go it to the next memory
storage device which is called your
memory card where you see your memory
card basically you can see your memory
card in your mobile phone in all your
mobile phones it is a memory card where
you store your data is like your photos
pictures audios songs okay where you
store on it in your memory card ok in
your digital camera also you use a
memory card so here we come to the point
similar to flash drive ok it is similar
to flash tank but in a car she but it is
comes in a card shape ok next point plug
and play again you just plug it and play
it on it whatever the data stored on it
so plug and play device that simply plug
into a port of a computer treated as
removable drive ok now next point useful
in electronic devices like camera music
player and you can also add your smart
force ok
next point available is storage
capacities are 8 MB 16 MB 64 MB 128 MB
256 MB 521 GB 2 GB 4 GB 8 GB and
nowadays it is going to be 64 GB more
and more in size ok so here we
thoroughly go through our all memory
devices they are accessing criteria ok
mechanism we cover all of it please
thoroughly go on it or the quotient
which will come to the remember e part
will definitely come from my this
lecture if you thoroughly go to my this
lecture then definitely you will be able
to answer any one a question ok and if
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friends my memory related topic is going
to be completed so there is what I am
going to come with my new topic which is
related to computer fundamental very
soon till then enjoy have a nice day