In English also Optical Disc Drive (ODD). Optical drives are used to
read optical media (mass storage). A CD-ROM drive reads CDs (CD =
Compact Disc) and CD- ROMs (ROM = Read Only ...
RAM / main memory called. This store temporary data that are
required for execution or processing of applications. The
difference between a hard drive is that the RAM stores the data
only as long as is until the power supply is interrupted."
class="seolink">Memory). A laser scans the CD randomly from in
order to read the data stored on it. The disc rotates in the drive
with a maximum of 10000 rpm. This type of drive is now obsolete and
has been almost completely replaced by DVD drives and combo
A DVD-ROM drive reads DVDs (digital versatile disc digital
versatile disc). The DVD in this case has a much larger capacity
than a CD.
A combo drive, however, combines the ability to read DVDs and CDs.
However, this can only describe as CD-RW and CD-R.
To describe DVDs you need a DVD burner. This reads both DVDs and
CDs and can describe both also. Small hint on the edge: DVD-R (DVD -Recordable)
stands for write once, DVD-RW (DVD-Rewritable) stands for
repeatedly writable, DVD-RAM (DVD-Random Access = MEMORY) is for, DVDs with free read and write
access and multi-variable data; DVD-DL (DUAL lAYER
DVD) represents two data layers on one side of the DVD
Then there is the Blu-ray technology, which still
can store larger amounts of data and is also backward compatible
with DVDs and CDs. Blu-ray burner can also write
DVDs and CDs in addition to Blu-ray discs. Blu-Ray drives work with another
laser technology as DVD drives. The used here, the laser beam has a
wavelength of 405 nm as opposed to 650 nm with a DVD laser. This
shorter wavelength allows dense to arrange the data on the disc and
thus achieve a higher storage capacity.