CD
Storage capacity of up to 700MB. CD-Rs can be used for storing data permanently,
as they only record once. CD-RWs allow you to record up to 1000 times,
but are only compatible with certain CD-RW drives. A 4x-1 Ox CD-RW is
compatible with CD-RW 10x drives and higher because it is the recording
speed (second figure) that is measured.
DVD
Storage capacity of up to 4.7GB. DVD recording ability, like CD, is A
for record once and RW for multiple recording. The difference between
+ and - is in the way the DVD records the data and DVD drives/players
may be compatible with either +/- or both. Dual layered DVD5 have two
layers of recording surface on a single side which nearly doubles capacity,
but are only compatible with a dual layered drive.
Blu-ray+ HD DVD
Blu-ray discs get their name from blue laser technology and HD DVD stands
for ‘High-density Digital Versatile Disc’. Both use the same blue laser
which has a shorter wavelength compared to DVD which uses red laser technology.
This vastly increases the amount of data on the disc. Capable of recording,
rewriting and playback of high definition video, discs are capable of
recording more than 2 hours of high definition programming.
USB
Drives
Storage capacity of up to 4GB. This is an easy way to save data, simply
plug and play using the USB connection, which also means a quick recording
time, Ideal for storing large files, eg. photos, music, presentations
and other digital files
External
Hard Drives
S torage capacity above 120GB. Ideal for those who require extra storage
space for their PCs or laptops. Connected by the USB port but powered
by the mains
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