$A d i s k h a s 8 e q u i d i s t a n t t r a c k s . T h e$
$d i a m e t e r s o f t h e i n n e r m o s t a n d o u t e r m o s t$
$t r a c k s a r e 1 c m a n d 8 c m r e s p e c t i v e l y . T h e$
$i n n e r m o s t t r a c k h a s a s t o r a g e c a p a c i t y o f$
$10 M B$

$W h a t i s t h e t o t a l a m o u n t o f d a t a t h a t c a n b e$
$s t o r e d o n t h e d i s k i f i t i s u s e d w i t h a d r i v e$
$t h a t r o t a t e s i t w i t h$

$(i) C o n s t a n t L i n e a r V e l o c i t y$
$(i i) C o n s t a n t A n g u l a r v e l o c i t y$

(i) 80 M B (i i) 360 M B

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(i) 360 M B (i i) 80 M B

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(i) 80 M B (i i) 2040 M B

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(i) 2040 M B (i i) 80 M B

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Solution

The correct option is B $(i) 360 M B (i i) 80 M B$
$I n C o n s t a n t L i n e a r V e l o c i t y, t h e d e n s i t y$
$o f b i t s i s i n c r e a s e s f r o m o u t e r m o s t$
$c y c l i n d e r t o i n n e r m o s t c y l i n d e r . S o,$
$C o n s t a n t L i n e a r V e l o c i t y = 10 + 20 + 30 + 40 + . . .80$

$= 360 M B$

$I n C o n s t a n t A n g u l a r V e l o c i t y, t h e d i s k$
$r o t a t e s a t a c o n s t a n t a n g u l a r s p e e d, w i t h$
$t h e b i t d e n s i t y d e c r e a s i n g o n o u t e r$
$c y c l i n d e r s .$

$S o,$

$C o n s t a n t L i n e a r V e l o c i t y = N u m b e r o f t r a c k \times C a p a c i t y o f e a c h t r a c k$

$= 8 \times 10 M B = 80 M B$

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