Consider a disk pack with 16 surfaces, 128 tracks per surface and 256 sectors per track 512 bytes of data are stored in a bit serial fashion in a sector. The capacity of the disk pack and the number of bits required to specify a particular sector in the disk respectively.
1
256 MB, 19 bits
2
256 MB, 28 bits
3
512 MB, 20 bits
4
64 MB, 28 bits