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Initial Field and
Field and Zone State
Command
Command Sequence
Zone State
at End of Command
Read Count, Key and Data
None
C1
04
Read Key and Data
None
C1
D4
After Search ID
C4
D4
Read Data
None
C1
D4
After Search ID
C4
D4
After Search Key
K4
D4
Write Count, Key and Data
Search Equal ID
C4
D4
Search Equal Key
K4
D4
Write RO
D4
D4
Write Count, Key and Ddata
D4
D4
Write Key and Data
Search Equal ID
C4
D4
Write Data
Search Equal ID
C4
D4
Search Equal Key
K4
D4
Search ID
None
C1
C4
Search Key
None
C1
K4
After Read or Search ID
C4
K4
Search Key and Data
None
C1
D4
After Read or Search ID
C4
D4
Search Home Address
None
HA
H4
Read RO
None
HA
D4
After Read or Search Home Addrs
H4
D4
Write RO
Write Home Address
H4
D4
Search Equal Home Address
H4
D4
Read Home Address
None
HA
H4
Write Home Address
None
HA
H4
Read Initial Program Load
None
C1
D4
Read Count
None
C1
C4
Erase
Search Equal ID
C4
D4
Search Equal Key
K4
D4
Write RO
D4
D4
Write Count, Key and Data
04
D4
No Operation
None
Reset Condition
Figure 2-6.
Track Orientatien Field and Zone State Summary
2. 43 TRACI< INITIALIZMION (DEFECTIVE-TRACK
DE'IERMI NATICN)
The following procedure must be followed by
track-initialization prograrrs fer the IEM
2311 files.
This procedure is intended to
write home addresses en each track and tc
analyze the condition of the recording
surface.
The program should be written to
handle the tracks in cylinder mode to
reduce running time.
1.
Read home address.
Verify that the
track has not been previcusly flagged.
This step must te typassed by operator
action when initializing the recording
surface for the first time.
Unless
specifically optioned by the cperatcr,
no program should change the flagging
of a previously flagged alternate or
defective track.
2.
write home address and record zerc (RO)
with a maximum-length data field on all
tracks.
'Ihe data Fattern should te
hexadecimal
5 5.
3.
Read home address and RO of each track
to ensure that the data can be
recovered successfully.
If an error
occurs, go to step 7.
4..
Repeat step 2, using a data pattern of
hexadeci ma 1 0 O.
5.
Repeat step 3.
If an error occurs, go
to step 7.
6.
Rewrite horre address and a standard
length record 0 on all good tracks.
Read and verify that these records can
te recovered successfully.
If an error
occurs, go the step 7.
The surface
analysis is new corrFlete.
7.
When an error occurs, an analysis of
the sense information must be made.
If
the error is a data-check in the count
2025 FEMM (7/69)
2-25
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