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e a c h t r a c k can be s u b d iv i d e d into a s m a n y a s 32 s e c t o r s .
the r e a d / w r i t e head at the t r a c k to b e a c c e s s e d .
the d i s k a r e s e n s e d p h o t o e l e c t r i c a l l y to p r o d u c e s e c t o r and ind ex p u l s e s that p e r m i t
a c c e s s i n g the in d iv id u a l s e c t o r s o f a t r a c k .
the p r o t e c t i v e e n v e l o p e is u n c o v e r e d the w r i t e - p r o t e c t e d c o n d i t i o n is s e n s e d p h o t o
e l e c t r i c a l l y , and w r i t e o p e r a t i o n s a r e inhib ite d.
Up to ei g ht d r i v e s c a n be i n t e r f a c e d to a s i n g l e hos t c o n t r o l l e r .
c o n t r o l s d i s k d r i v e s e l e c t i o n , head l o a d i n g , t r a c k a d d r e s s i n g , and r e a d / w r i t e data
t r a n s f e r s .
W he n a d i s k c a r t r i d g e is i n s e r t e d and the a c c e s s d o o r is c l o s e d , the d r i v e s p i n d l e
r o t a t e s the d i s k at 360 r e v o l u t i o n s p e r m i n u t e .
a head loa d c o m m a n d , c a u s i n g the r e a d / w r i t e head to b e l o a d e d to the d is k .
the d r i v e s e l e c t e d , s e c t o r / i n d e x p u l s e s , w r i t e - p r o t e c t s t a t u s , t r a c k 00 p o s i t i o n
s t a t u s , and a r e a d / w r i t e r e a d y s t a t u s is s u p p li e d to the c o n t r o l l e r .
t r a c k , a data t r a n s f e r o p e r a t i o n is p e r f o r m e d ; r e a d - t o the c o n t r o l l e r , w r i t e - f r o m
the c o n t r o l l e r , d e p e n d in g o n the s t a t e o f the w r i t e c o m m a n d .
D u r in g a w r i t e o p e r a t i o n (d is k not w r i t e - p r o t e c t e d ) , w r i t e data is input to the w r i t e
c i r c u i t s .
F o r e a c h w r i t e data p u l s e r e c e i v e d , a flux r e v e r s a l is r e c o r d e d on the
d i s k b y the r e a d / w r i t e head.
D u r in g a r e a d o p e r a t i o n , e a c h r e c o r d e d flux r e v e r s a l is s e n s e d b y the r e a d / w r i t e
h e a d , c o n v e r t e d to a r a w data p u l s e and s u p p li e d to the c o n t r o l l e r .
A p p l i c a t i o n s f o r the F l o p p y D i s k D r i v e incl ude:
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K e y E n t r y S y s t e m s
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P o i n t - o f - S a l e R e c o r d i n g S y s t e m s
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W o rd P r o c e s s i n g S y s t e m s
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B a t c h T e r m i n a l Data S t o r a g e
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S m a l l B u s i n e s s S y s t e m s D ata S t o r a g e
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M i c r o p r o g r a m L o a d i n g and E r r o r L o g g i n g
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M i n i c o m p u t e r P r o g r a m s and A u x i l i a r y Data S t o r a g e
A s t e p p e r m o t o r p o s i t i o n s
In de x and s e c t o r h o l e s punched into
When the o p t io n a l w r i t e - p r o t e c t s l o t in
W hen s e l e c t e d , the d r i v e a c c e p t s
1-2
T h e c o n t r o l l e r
With
At the d e s i r e d
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