FORMATTING
6.3
Figure 22 illustrates a suggested format example.
INTER
RECORD
GAP
WRITE
TURN-OFF
GAP
ADDRESS
MARK
DATA
CRC
DATA
SYNC
VFO LOCK
SYNC BYTE
WRITE
TURN-ON
GAP
FIELD
NAME
ID
VFO LOCK
ADDRESS
MARK
CYLINDER
NUMBER
HEAD
NUMBER
SEClOR
NUMBER
CRC
SYNC BYTE
3
3
2
2
15
13
512
2
NUMBER
OF
BYTES
13
9
5
7
S
6
2
4
3
14
11
10
12
13
15
REFERENCE
NUMBER
1
FIGURE
22:
17
Sector,
512-Byte/Sector
Format Example
FIELD
DESCRIP110N
A field
of
ail zeros
to
sync
the
VFO
for
the
ID
"Al"
Hex with a
dropped
clock
to
noti-
fy
the
controller
that
data
follows.
"FE"
Hex defining
that
ID field
data
follows.
A numerical value in Hex defining
the
detent position
of
the actuator.
A numerical value in Hex defining
the
head selected.
A numerical value in Hex defining
the
sector for this section
of
the
rotation.
Cyclic Redundancy
Check information used
to
verify
the
validity
of
the
ID
field information
just
read.
Zeros written during format
to
isolate
the write splice created. This field
assures valid reading
of
field
number
7
and
allows
the
13
bytes required for
Data
VFO lock.
A field
of
all zeros
to
sync
the
VFO for
the
data
field.
"Al"
Hex with a dropped clock
to
noti-
fy
the
controller
that
data
follows.
"FS"
Hex defming
that
user
data
follows.
This area available for user data.
Cyclic Redundancy
Check information used
to
verify
the
validity
of
the
user
data
field informa-
tion
just
read.
Zeros written during update
to
isolate
the
write splice created. This field
assures valid reading
of
field
number
13
and
allows
the
13
bytes required for
VFO lock for
the
ID field
of
the
next
sector.
A field
of
all zeros which acts as a
buffer between sectors
to
allow for
n speed variation. n
~
Il.---
----.JI
L
14
1
15
L~
/:~x~~
(NOMINAL)
12
1
13
1
11
10
1
98
571
BYTES
TOTAL
)K
1
GAP
1
/16X4E
ID
FIELD
GAP 2
DATA FIELD
INTER·RECORD
GAP
IOVfO
SYNe
AoOR
CYLINDER
HEAD
SCTA
WRITE
DATA SYNC
SYNe
AoOR
WAtTE
INTER-
LOCK BYTE
MARK
ADDR
NO
NO
CAC TURN.()N
VFD
BYTE
MAAK
DATA
CAC
TURN<JFF
AECORD
GAP
LOCK
....
GAP
NUMeEA
13
Of
BYTES
2 2
13
512
2
3
15
FELONO
1
2
3
4
5
6 7 9
10
11
12
13
,
....
only)
14 15
STl12 PRODUCT MANUALIRev. B
25
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