a$)$ Assume that an external hard drive has $2$ Tbyte of available memory for storage. How many bits are needed for addressing its memory assuming each memory location contains $1$ byte as always?

$(5$ points$)$

b$)$Assuming your answer from part $($a$)$ above, please specify how many symbols are needed to write the addresses of these memory locations in hex notation?

$(5$ points$)$