Given that:
we know that:
Disk capacity=Number of surface* number of track/surface* number of sector/track*number of byte/sector
$\implies2^{39}=2^5*x*2^{12}*2^{10}$$\implies2^{39}=x*2^{12+10+5}$$\implies2^{39}=x*2^{27}$$\implies x=\frac{2^{39}}{2^{27}}=2^{12}=4096$
$\therefore$ the number of cylinders is $4096.$
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