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Uses To hold large files such as films that has
a size of a couple of GB.Advantages CDs tend to be used for large files (but
smaller than 1Gb) DVDs are used to hold very large files (several Gb’s) such as movie films. Both CDs and DVDs are Portable.Disadvantages Files could be broken. it is a Single ‘burning data’
Uses CDs used by software
companies for giving out software programs and data; by Music companies
Advantages CD ROM and DVD ROM are
Applications which require the prevention of deletion of data.
DVDs used by film distributors to give out films.
Disadvantages It can be written only once. It can be only read. The file could break.
CD ROM
DVD ROM
Uses Applications which require a single ‘burning’
of data, e.g. CDs DVDs can record film movies and television
programs.Advantages Can record music downloads from the
Internet, Music from MP3 format and it records data for archiving or backup purposes.
Cost of buying both devices are cheap Access to files are fast.Disadvantages Can be written only once (in other words, it is
a single burning data) Has a short lifespan (usually less than
10years)DVD-R
CD-R
Uses It is an application which requires the updating
of information and has an ability to record over old data.
Advantages It is very useful for keeping generations of files. It is pretty much like a 700MB floppy disk Can be written and read more than once. Disadvantages Not suitable for music recording. It has a low rate of writing files Cost of both devices are basically expensive Cannot be read over by older optical drives.
DVD-RW
CD-RW
Uses DVD RAM is used in video
recorders, camcorders and computer memory.
Advantages Very fast access of small files on the
disc. Disc defect management designed
to safeguard data. Can be rewritten over 100,000
timesDisadvantages Lower quality than DVD+RW and
DVD-RW, despite predating both formats.
DVD-RAM
Uses HD DVD is used in video recorders and
computer memory as well as games main rival is blu-ray.Advantages Can store high definition videos and files. Audio quality is high. The cost of buying the HD DVD format is
cheap.Disadvantages Region coding is vague. The majority of companies have dismissed
developing the HD DVD technology.
HD-DVD
Uses Used in video recorders and computer memory
as well as games consoles. It has the largest storage capacity amongst all other optical devices.
Advantages It can hold 4.5 hours of HD (high definition)
videos It has a large capacity of storing devicesDisadvantages The cost of buying this format is much more
expensive when compared to the cost of HD DVD format.
It has a lower audio quality when compared to HD DVD.
Blu-ray disc
Pen Drives and memory cards are classified as NAND style data storage devices .
Both storage devices are considered to be an improvement on both the older floppy drive disks and the more modern compact disks.
Advantages They are resistant in scratches and dust. Files can be transferred quite easily Large capacity PortableDisadvantages Has a limited number of write and erase
cycles before failure Can be infected by viruses quite easily. Files can be damaged by physical
impacts (E.g. Dropping) It has great speed
Pen drive
Memory cards
It is the smallest form, used as a removable storage
More robust than other forms of storage Can be easily written and updated. Contains no mechanic parts. Everything is done electronically. Solid state backing storages has a much
higher speed than is possible with electromechanical disk drives.
Solid state backing storages lags in terms of storage capacity.
The cost is basically expensive when compared to electromechanical drives.
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