R E C O R D I N G F O R M A T; E N C O D I N G S C H E M E; T R A C K F O R M A T - Siemens 100-8D Technical Manual

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R E C O R D I N G F O R M A T

T h e r e c o r d i n g f o r m a t
a n d s e c t o r o r g a n i z a t i o n of d a t a Is d e p e n d e n t o n t h e f o r m a t .

E n c o d i n g S c h e m e

T h e d r i v e a l l o w s d o u b l e - d e n s I t y o r s I n g l e - d e n s I t y e n c o d i n g s c h e m e s .
d e n s i t y r e c o r d i n g , e a c h b i t c e l l Is 2 m i c r o s e c o n d s w i d e , In s i n g l e - d e n s Ity r e c o r d ­
i n g , e a c h b i t c e l l Is 4 m i c r o s e c o n d s w i d e ( s e e F i g u r e 1 - 3 ) .

T r a c k F o r m a t

T h e f l o p p y d i s k c o n t a i n s 77 t r a c k s .
l a s t ( I n s i d e ) t r a c k Ls 76.
r e a d - w r l t e h e a d e r a s e s t h e o u t s i d e e d g e s o f t h e d a t a j u s t w r i t t e n , n a r r o w i n g t he
d a t a t r a c k .
I n t h i s m a n n e r , a g u a r d b a n d Is e s t a b l i s h e d to p r o t e c t t h e d a t a f r o m
a d j a c e n t t r a c k c r o s s t a l k w h e n r e a d i n g .
-► 1 CELL
- * - ( 5 0 '0 KBS)
12
SEC
m
1
FT
WRT DATA
- ► ] 2
SEC f— -
m
BIT CELL
-
4
SEC
iu
1
I
i n
WRT DATA
j 2
SEC h -
m
F i g u r e 1-3.
d e p e n d e n t u p o n r e q u i r e m e n t s o f t h e c o n t r o l l e r .
l s
T h e f i r s t ( o u t s i d e ) t r a c k is t r a c k 0 0 , a n d t h e
D u r i n g t h e w r i t e o p e r a t i o n , a n e r a s e
1
0
0
I
0
j
u
CLOCK
CLOCK
DOUBLE-DENSITY ENCODING (MFM)
(250 KBS)
1
i
n
n
CLOCK
DATA CLOCK
SING LE-DENSITY ENCODING (FM)
S i n g l e and D ou b l e D e n s i t y E n c o d in g
1
1
1
I
I
I
I
I
I
i m
j
DATA
DATA
DATA
0
0
i
!
n
r
¥
u
CLOCK
CLOCK
1-5
T h e t r a c k
I n d o u b l e -
c o l l i n t h e
0
1
0
u
if
CLOCK
DATA
0
1
i
n
n
CLOCK
DATA
CLOCK
i
r

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