Q41

A disk of size $512 \text{ M}$ bytes is divided into blocks of $64 \text{ K}$ bytes. A file is stored in the disk using linked allocation. In linked allocation, each data block reserves $4$ bytes to store the pointer to the next data block. The link part of the last data block contains a NULL pointer (also of $4$ bytes). Suppose a file of $1 \text{ M}$ bytes needs to be stored in the disk. Assume, $1 \mathrm{~K}=2^{10}$ and $1 \mathrm{M}=2^{20}$. The amount of space in bytes that will be wasted due to internal fragmentation is __________. (Answer in integer)