These slides give about the short detail about the cloud storage and optical devices.

1. Cloud Storage And Optical Disks

2. Cloud Storage
And
Optical Disks
By:
Sayam Asjad

3. Cloud Storage
• Cloud Storage is an internet service that provides hard disk
storage to computer users.
• Types of services provided by service providers vary. Figure shows
variety of cloud storage providers.
Some of the more widely used cloud storage providers

4. Fee Arrangements
• Policies regarding fee arrangements vary.
• For example, one cloud storage service provides 25 GB of storage
free to registered users.
• Another charges $5 per month for 150 GB of storage.
• For enterprises, cloud storage services typically charge for storage
on a per gigabyte basis, such as 15 cents per gigabyte

5. Reason to subscribe ?
• To access files on the Internet from any computer or device that has
Internet access.
• To allow others to access their files on the Internet so that others can listen
to an audio file, watch a video clip, or view a photo — instead of e-
mailing the file to them.
• To view time-critical data and images immediately while away from the
main office or location. For example, you can view important if you are
away from home or office.
• To store offsite backups of data.
• To provide data center functions, relieving enterprises of this task

6. Optical disks
• An Optical disc is type of optical storage media that consists of a flat,
round, portable disc made of metal, plastic, and lacquer.
Optical Disc Drive in PC
• Optical Disc may be one/double sided.
• Light scribe technology.
• Optical Discs store items in form of
microscopic pits and lands.
• A high-powered laser light creates the
pits.
• A lower power laser reads items and
the reflected light is converted into
bits.

7. • Manufacturers claim that a properly cared for high-quality optical
disc will last 5 years but could last up to 100 years.
Some guidelines for the proper care of optical discs

8. Formats of Optical disks
• Figure describes a variety of
optical disc formats and
specifies whether a user can
read from the disc, write to the
disc, and/or erase the disc
• It also characteristics unique to
each of these disc formats

9. CDs
• A CD-ROM, or compact disc read-only memory, is a type of optical disc
that users can read but not write (record) or erase — hence, the name
read-only.
• A standard CD-ROM is called a single-session disc because
manufacturers write all items on the disc at one time.
• A typical CD-ROM holds from 650 MB to 1 GB.
• CD-Rs and CD-RWs allow users to write data with CW-R and CD-RW
drive. The Process of writing on a optical disc is called burning.
• A CD-R(compact disc-recordable) is a multisession optical disc on which
users can write, but not erase their items such as text, audio, videos etc.
• A CD-RW(compact disc-rewritable) is an erasable multisession disc you
can write on multiple times.
• The process of copying audio and/or video data from a purchased disc
and saving it on digital media is called Ripping.

10. Archive Discs and Picture CDs
• You can save shared photos on a archive disc from a photo sharing
community, which stores in jpg file format.
• A Kodak Picture CD stores digital versions of film using a jpg file
format.

11. DVDs and Blu-ray Discs
• A DVD-ROM is a high-capacity optical disc on which users can read but
not write or erase.
• DVD-ROM uses three storage
techniques.
• The first involves making the disc
denser by packing the pits closer
together.
• The second involves using two
layers of pits. lower layer of pits is
semitransparent so that it can
through it to the upper part. This
technique doubles the capacity of
the disc.
• Finally, some DVD-ROMs are
double-sided.

12. • A Blu-ray Disk (BD) is a format which has storage capacities of 100 GB
storage capacities of DVD and Blu-ray media
• HD VMD
• UMD.
• A mini-DVD
• The mini Blu-ray
Disc
• DVD-R, DVD+R and BD-R allow users to write on the disc once and
read (play) it many times.
• DVD-RW, DVD+RW, and DVD+RAM are rewritable DVD formats.
• BD-RE is a high-capacity rewritable DVD format.
• To write on these discs, you must have a compatible drive or recorder.
Recordable and Rewritable DVDs