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# Calculation of Disk Capacity

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Consider a disk with the following characteristics (these are not parameters of any particular disk unit): block size B=1024 bytes, number of blocks per track=10, number of tracks per surface=400. A disk pack consists of 15 double-sided disks.

(a) What is the total capacity of a track?
(b) How many cylinders are there?
(c) What is the total capacity of a cylinder?
(d) What is the total capacity of a disk pack?

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(a) What is the total capacity of a track?
total capacity of a track = block size*blocks per track = 1024*10 = 10240 bytes

(b) How many cylinders are there?
there are 400 cylinders because number of cylinders = number of tracks per surface

(c) What is the total capacity of a cylinder?
total capacity of a cylinder = 15*2*10*1024=307200 bytes

(d) What is the total capacity of a disk pack?
total capacity of a disk pack = total capacity of a cylinder*tracks per surface = 307200*400 = 122880000 bytes

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