R1 Field - Honeywell 6000 Series Reference Manual

ADDRESS MARKS C} BYTES WI'I'IIUI I'I' ANY
STARTS AH. RECORDS AFTER RU.
SAME AS GAP 2
REF: FIGURE 2-7
ADDRESS MARKS ARE USEDTO FIND THE
START OF A RECORD WITHOUT WAITING
SPLICE
FOR INDEX.
AREA
PLO SYNC AREA SAME As GA? 2
REF: FIGURE 27
v
i
I
\
SEXIEEER 41 BYTES ERRRESS 12 BYTES SYNC II)
, ZEROS , ZERO max 19 max 19
1 BYTE 3 BYTE GAP
\
_/
'1 ALL ZEROS FROM END
6
'
OF LAST DATA FIELD
A
r—{RBE FIGURE 27
.
l
LTO INDEX
GAP 3 R1 COURT GA? 2
R' ""5. "AP. 3 LAST .
INDEX
r'RI FIELD AND ALL OTHERS FOLLOWING
59 BYTES 4} + 75"" 49 BYTES 3:; F" 3:56:11" "AP 4 POINT 1. NORIMAL CUSTOMER DATA FIELD )
IHTE b 2. COUNT FIELD DEFINES LENGTH OF DATA FIELD.
¥
,
TRACK ADDRESS AND SECTOR NUMBER.
'0: 3. DATA FIELD CONTAINS THE CUSTOMER DATE.
4. DATA FIELDS CAN BE REWRITTEN WITHOUT
A L_ CHANGING BALANCE OF THE TRACK.
2:332:35" FLAG
CYLINDER . CYLINDER
HEAD HEAD
RECORD KEY LENGTH
EEEéTH [82$ng
7 ECC BYTES
'
\
J \
/ .
'
9
V v V
CYLINDER ADDRESS HEAD ADDRESS f
'SAME As HOME'
(0-410)
"H 81
'NUMBER OF THE
' ' RECORD (1.31)
ADDRESS
DEFECTIVE TRACK = USE CCHH OF ALTERNATE TRACK
ALTERNATE TRACK = USE CCHH ()F DEFECTIVE TRACK
'DEFINES THE CONDITION OF THE TRACK.
BITS 0-5 = UNUSED AND WRITTEN AS ZEROS
BITS 6-7 = INDICATES CONDITION OF TRACK
00 = NORMAL TRACK
01 = ALTERNATE TRACK
10 = DEFECTIVE TR ACK
v
Figure 2-9.
I ' j
NUMBER OF BYTES IN.
THE KEY FIELD (ZERO':
.Rl Field
7 BYTES USED FOR ERROR DETECTION}
'NUMBERRW BYTES W
THE DATA FIELD (288)
AND CORRECTION
3