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C A R R I A G E A S S E M B L Y; R E A D / W R I T E S Y S T E M; R E A D / W R I T E O P E R A T I O N - Siemens 100-8D Technical Manual

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S t e p p e r M o t o r
Th e v a r i a b l e - r e l u c t a n c e s t e p p i n g m o t o r p r o v i d e s p r e c i s i o n p o s i t i o n i n g of the r e a d /
w r i t e head.
The s t e p p e r m o t o r is e n e r g i z e d by + 24 v o l t s dc and o p e r a t e s in e i t h e r
D e t e n t o r P o s i t i o n i n g m o d e .
In the D e t e n t m o d e , an in t e r n a l g e n e r a t e d m a g n e t i c fi el d h ol d s the r o t o r in a
fix ed p o s i t i o n .
To m o v e f r o m d e t e n t , one of t h r e e c o n t r o l l i n e s is g r o u n d e d , d r i v ­
ing the r o t o r to the next de te n t.
the r o t o r sh aft to r ot a t e th ro u g h d ete nt p o s i t i o n s at a m a x i m u m rate o f 333 s t e p s
p e r s e c o n d .
A l e a d s c r e w on the e x p o s e d r o t o r s h a ft c o n v e r t s r o t a r y m o v e m e n t s
to l i n e a r m o v e m e n t to d r i v e the c a r r i a g e a s s e m b l y .

C a r r i a g e A s s e m b l y

The c a r r i a g e a s s e m b l y r i d e s on a le a d s c r e w w h i l e a f i x e d w a y p r e v e n t s the
c a r r i a g e f r o m s k e w i n g .
p e r f o r m s the in and out p o s it io n in g .
The r e a d / w r i t e h e a d , a t t a c h e d to the c a r r i a g e a s s e m b l y , c o n t a c t s the r e c o r d i n g
s u r f a c e w he n the d r i v e is s e l e c t e d .
load a r m that m o v e s the flo pp y d i s k into c o n t a c t w ith the r e a d / w r i t e head.

R E A D / W R I T E S Y S T E M

T he r e a d / w r i t e s y s t e m r e c o r d s e n c o d e d data d u ri n g a W r i te o p e r a t i o n , and
r e t r i e v e s data du rin g a Read o p e r a t i o n .
t r o l l e r d e s i g n a t e s a Re ad w he n high o r a W r i te w he n low.

R e a d / W r i t e O p e r a t i o n

The r e a d / w r i t e head is e s s e n t i a l l y an e l e c t r o m a g n e t that ca n c o n c e n t r a t e a high
m a g n e t i z i n g f o r c e o v e r a v e r y s m a l l a r e a of the a d j a c e n t r e c o r d i n g s u r f a c e .
r e c o r d i n g , the flux fie ld is a l t e r n a t e d to m a g n e t i z e the d i s k w ith the d e s i r e d bit
pattern.
The r e a d / w r i t e head a l s o c o n t a i n s a t u n n e l - e r a s e o r s t r a d d l e - e r a s e
e l e c t r o m a g n e t , the fu n cti on o f w h i c h is to e r a s e the e d g e s of the r e c o r d e d t r a c k as
data is b ein g w r it t e n .
0. 0 1 3 - i n c h by t h is t e c h n i q u e , to m i n i m i z e the e f f e c t of data p r e v i o u s l y w r i t t e n on
the t r a c k and p o s s i b l e c r o s s t a l k b e t w e e n t r a c k s .
S e q u e n t i a l l y g ro un din g c o n t r o l w in d in g s c a u s e s
The way s e r v e s as a guid e w h i l e the le a d s c r e w d ri v e
Th is c o m m a n d r e l e a s e s a s p r i n g - l o a d e d head
T h e width of the t r a c k is n a r r o w e d to a p p r o x i m a t e l y
3 - 4
Th e w r i t e (WRT) s i g n a l f r o m the c o n ­
When

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