74
– CD-ROMs (read-only memory) are read-only units,
meaning you cannot change the data stored on them (for example,
a dictionary or a game).
– CD-R (recordable) discs are write-once devices which let
you duplicate music CDs and other data CDs.
– CD-RW (rewritable) discs enable you to write onto them
many times, just like a hard disk.
– DVDs also come in several formats:
– DVD-ROMs are used in DVD computer drives. They al-
low for data archiving as well as interactive content (for example,
an encyclopedia or a movie).
– DVD-R or DVD+R can only be recorded on once.
– DVD-RW or DVD+RW discs can be erased and reused
many times. They are used to back up data files and to record au-
dio and video.
The DVD drive used in computers is also called a DVD burn-
er because it records information by burning via a laser to a blank
DVD disc.
Достарыңызбен бөлісу: 
