The Computer System Class 4 Brain Teaser

I can be a name,number,date etc. Who am I?
DATA
I can store the data permanently in the computer's memory. Who am I?
ROM
I can store the data temporarily in computer's memory. Guess?
RAM
I am the standard unit of storage in a computer
BYTE
I can store large amount of data.
Hard Disk
I can store upto 700 MB of data.
CD
I can store upto 17 GB of data.
DVD
I am a storage device and can be carried easily because of its small size.
Pen drive
End Of Game
Time
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