$4....$A disk has $28$ recording surface has $12000$ tracks. There is an average of $600$ sectors per track. Each sector contains $512$ Bytes of data.

a$.$ What is the maximum number of bytes that can be stored? $(1$ Mark$)$

b$.$ What is the data transfer rate in bytes per second at a rotational speed of $6400$rpm$?[1$ Mark$]$

c$.$ Using a $32$ bit word, suggest a suitable addressing scheme for the disk.

$(1+1+1=3$ Marks$)$