Zenith Z-100 Series, Руководство пользователя

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Page 6-5
D uring th e i n i t i a l i z a t io n p r o c ess, you w i l l s e e t h e
following display on the screen:
b eing stored. Since "l i ke " charges repel and "u n l i k e "
charges attract, it is possible for the charged areas
o n th e d i s k s u r f a ce, w h i c h r e p r e sent t h e d a t a , t o
"shift" slightly if they are closely spaced after being
r ecorded. If s uc h a s h i f t o c c u rs, reduced r e l i ab i l i t y
will result .
Precompensation refers to the intenti onal shi f t in g of
d ata durin g th e r ecor d in g p r o cess so the co m b i n e d
r esult o f
p r e c o m p e n sation a n d t h e n a t u r a l s h i f t
( which cannot b e p r ev ented) p l aces the data i n t h e
desired positi on. On the outer tracks of the di sk, the
s pacing between b it s i s g r eat enough so n o s i g n i f i -
c ant shiftin g occurs and p r ecomp ensation i s no t r e -
quired, How ever, since the inner tracks have a smal-
l er circ u m f erence, th e b i t s ar e c l o ser t o gether an d
precompensation is requi red to m a i n t ain acceptable
reliabili ty. Enter 80 (the cyli n der n u m ber w h ere pre-
compensation m u s t s t a rt ) an d p r e s s th e R E T U R N
k ey, Next, the screen wil l d i s p l ay :
see:
,.completed
I nit i a l i z i n g t h e d i s k . .
a nd return t o t h e Z - D O S p r o m p t ; th e d i s k w i l l n o t
b e affected. Remember, to run th e PREP ut i l i t y , y o u
m ust in stall t h e j u m p e r o n t h e c o n t r o l le r b o ar d a s
explained earlier.
W hen th e d i s k h a s b een f u l l y i n i t i a l i z ed , yo u w i l l
If you have not installed the jumper on the controller
board, the system will immediately display:
Error during formatting of the drive.
Enter step rate code in hex:
• E nt er 1 ( t h e r a te code in h e xa decimal at w h i c h
t he r ead/w r it e h e ad s " s t ep " b e t w e e n t r a c k s )
and press the RETURN k e y.
Now th e d i s k w i l l b e t e s ted seven t i m es. Each test
is know n a s a " p a s s," Th e s even p asses of th e t e st
t hat are now p e r f o r med are con d u c ted to c h eck t h e
integrity of th e d i s k ' s storage capacity. D u r in g each
p ass, PREP w i l l " w r i t e " a p r e d e t er m i ne d c o d e i n
each sector (the LED drive access light will fl i cker)
a nd then w i l l " r e a d " b a c k t h a t c o d e t o v e r i f y t h a t
i t remained correct (the LED d r iv e access light w i l l
a ppear to be constantly o n). PREP wil l k eep yo u i n -
formed of its progress by displaying the message:
N ow that you h ave sup p l ie d th e necessary info rm a-
t ion fo r t h e h a r d d i s k , t h e p r o g ram w i l l i n i t i a l i z e
t he surface of the d isk fo r th e tests that fo l l ow . T h e
i nitialization p r o c ess is si m i l a r t o t h a t u sed b y t h e
Z-DOS and CP/M-85 FORMA T u t i l i t y i n t hat the sur-
face of each disk is organized into tracks and sectors.
I n add i t i on , a " m a p " i s a l s o p r e p ared fo r k e e p i n g
track of any sectors that are found to be bad.
Media test in progress. Pass n
where n r e p r e sents t he c u r r e nt p a ss n u m b e r. T h i s
p hase of PREP takes about a n h o u r a n d a h a l f b e -
cause of the large number of sectors on the Wi n c h es-
ter disk system.