Presemtation Storage Devices

Optical storage device
Here some information

CDs and DVDs
Can be used for:
CDs tend to be used for large files (but smaller than 1Gb)
which are too big for a floppy disc to hold such as music and
general animation.
DVDs are used to hold very large files (several Gb) such as
movie films. Both CDs and DVDs are portable i.e. they can
be transported from one computer to another.
Both can be used to store computer data.
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CDs and DVDs
Advantages:
DVDs and CDs are good for a large surface area
CDs and DVDs are interactive
Disadvantages:
CDs and DVDs require physical distribution.
DVDs need DVD player
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CD ROM/DVD ROM
Applications which require the prevention of deletion of data,
accidental or otherwise.
CDs used by software companies for
distributing software programs and data; by Music companies
for distributing music albums and by book publishers for
distributing encyclopaedia’s, reference books etc.
DVDs used by film distributors.
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CD ROM/DVD ROM
Advantages:
They are self-paced.
In CD ROM and DVD Rom can be stored any data until its capacity
limit.
They a re highly interactive.
Disadvantages:
For updates it requires new CD.
DVD ROM format’s biggest disadvantage it that it can’t be used more
than once.
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CD R/DVD R
Applications which require a single ‘burning’ of data, e.g. CDs– recording of music downloads from the Internet, recording of music from MP3 format, recording of data for archiving or backup purposes.
DVDs – recording of film movies and television programs.
Advantages:
Long life — without physical damage, data is retained for an
estimated 30 years. For this reason, it has uses in archival storage.
Disadvantages:
DVD-RAM media have always been more expensive than other types
of DVD.
Less compatibility than DVD+RW and DVD-RW, despite predating
both formats .
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CD RW/DVD RW
Applications which require the updating of information and ability to
record over old data.
Not suitable for music recording but is very useful for keeping
generations of files.
DVDs have between five and ten times the capacity of CDs.
Advantages:
DVD-RW disc is a rewritable optical disc with equal storage capacity
to a DVD-R, typically 4.7 GB.
Disadvantage:
Not good for recording music files
Old optical drivers can not read
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DVD RAM
Housed in a cartridge.
Used in video recorders, camcorders and computer memory.
Advantage:
Very fast access of small files on the disc.
Disc defect management designed to safeguard data.
Disadvantage:
Less compatibility than DVD+RW and DVD-RW, despite predating
both formats .
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HD DVD
Used in video recorders and computer memory as well as games consoles – main rival to blu-ray.
Advantages:
Easy to manufacture
Bigger pits to read
Disadvantage:
Not as much capacity as in blu ray.
HD DVD may not be developed in the future
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Blu-ray
Used in video recorders and computer memory as well as games consoles.
Largest storage capacity of optical media.
Advantages:
Ability to store either 25GB or compress the data to fit up to 50GB of
Data.
The only optical disc device that holds high-definition quality audio
and video
Disadvantages:
Blu-ray discs and players are still very expensive
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Solid state backing storage
Smallest form of memory, used as removable storage.
More robust than other forms of storage.
More expensive than other forms but can be easily written to and updated.
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Memory sticks/Pen drives
Can store up to many Gb.
Used to transport files and backup data from computer to computer.
Can transfer data between two PC's using their USB ports.
Small and Comfortable
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Flash memory cards
Used in digital cameras, palmtops, mobile phones, MP3 players.
Flash memory cards are non-volatile
Its smaller than flash drive
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Presemtation Storage Devices

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