Magnetic disk has 100 cylinder. Each cylinder contains 10 tracks.
Each track contain 10 sector & each sector contains 128 B of data.
Total Capacity = (No. of cylinder) * (No. of track in each cylinder) * (No. of sector in each track) * (Capacity of each sector)
= 100 * 10 * 10 * 128 B = 1280000 B = (1280000 / 1024 ) KB = 1250 KB.
So, maximum capacity is 1250 KB.