CD

CD is the short form of Compactable Disc
It stores data digitally.
Laser beams used to read data from CDs

 

CD uses optical technology to store data in it.
The normal capacity of a CD is 750 MB

CDs are storing data as pits and humps. Pits reprasents lack of data and humps, presence of data.
Humps are used to reprasent 1's and pits for 0's.



CDROM:

It means Compactable Disc Read Only Memory.
Here, we can read the data from CD's. But we can't write into it.


CDRW:

Compactable Disc Read Write
Here, we can perform both read and write operations.