How to explain hard disk size?

This is a conversation I had with a colleague on hard disk size:

Colleague [1:31 PM]:
fuyoooo..
how big hard disc...?

‎Lee, Hanxue ‎‎ [1:40 PM]:
This big
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Colleague[1:40 PM]:

pigilaaa

‎‎Lee, Hanxue SITI-ITIBCP101‎‎ [1:41 PM]:
Capacity is

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What?? I am giving you accurate information lar

Colleague‎‎ [1:41 PM]:
pigilaaaa....