Consider a disk pack with $32$ surfaces, $64$ tracks and $512$ sectors per pack. $256$ bytes of data are stored in a bit serial manner in a sector. The number of bits required to specify a particular sector in the disk is
Surfaces=2^5, Tracks=2^6, Sectors=2^9
So, no of sectors= 2^(5+6+9)=2^20
option A
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