According to the computer science what isCD ROM is a

A CD-ROM (/ˌsiːdiːˈrɒm/, compact disc read-only memory) is a pre-pressed optical compact disc that contains data. Computers can read—but not write to or erase—CD-ROMs, i.e. it is a type of read-only memory.
Read mechanism: 600-780nm laser diode, 150 ...
Usage: Data storage
Capacity: 194 MiB (8 cm), 650–900 MiB (12 cm)

Hope this helps...

Answera fixed regular payment;