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Page ofGA26-1615-3
Revised August 19, 1974
By TNL: GN26-0310
TRACK FORMAT
Data Record R1
Data Record R2-Rn
Index
R1 Count
Area
G2
R1 Key
R1 Data
R2-Rn Cnt G 2
~2-Rn
Key G 2
R2-Rn Data G 4
Area
G 2
Area
G3
Area
Area
Area
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G2
IKEYI Eccl
G2
loAT~Ecc
I
GJ
~ ~,C'" ,H[R[~lo,~ECCI
G2
I
KE~
Ecc I
G2
I DATA[ Ecc
I
K
F
C..lC H..lH R L D..ll ECC
ID
KEY AREA:
Identifies the information in the data field.
ECG (Error Correction Code):
Generated by the 3333 - used
for error detection and correction.
RO Data Area
G2 (Gap 2):
Precedes all data areas.
DA tA AREA*:
Contains the information identified by the
count and key areas.
ECG (Error Correction Code):
Generated by the 3333 - used
for error detection and correction.
DATA RECORD
Data Record Count Area
G3 (Gap 3):
Precedes all count areas (except RO).
F (Flag):
Same as Record Zero.
CC (Cylinder Number):
Specifies the cylinder number (from
0 to 410 for Models 1 and 2, 0-814 for Model 11.
HH (Head Number):
Specifies the read/write head within the
selected cylinder (from 0 to 18).
R (Record Number):
Specifies the sequential number of the
record on the track.
Figure 3. Record and Track Format (P<Ut 2 of 2)
ID
KL (Key Length):
Specifies the number of bytes in the key
area (from 0 to 255 bytes).
DL (Data Length):
Specifies the number of bytes in the
data area (from 1 to track capacity).
ECC (Error Correction Code):
Generated by the 3333 - used
for error detection and correction.
Data Record Key Area
G2 (Gap 2):
Precedes all key areas.
KEY AREA:
Identifies information in the data area.
ECG (Error Correction Code):
Generated by the 3333 - used
for error detection and correction.
Data Record Data Area
G2 (Gap 2):
Precedes all data areas.
DA TA AREA:
Contains the information identified by the
count and key areas.
ECG (Error Correction Code):
Generated by the 3333 - used
for error detection and correction.
G4 (Gap 4):
Written from the end of the last data area to
index.
*See ''Track Descriptor Record (RO)"
Formats 7
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