Storage Devices

Here some information

OPTICAL STORAGE DEVICE

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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 andgeneral 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 fordistributing software programs and data; by Music companiesfor distributing music albums and by book publishers fordistributing 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 filesOld 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