Xerox 7240 Reference Manual page 36

Table 9. Removable Disk Storage System Testing Sequence (cont.)
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Sequence and Summary Description
Condition Code, Status Response Bits and DetaHed Description
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Recommended Corrective Action
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Step 11. Unusual End. If none of the above error indications (as described in
x
Use Recovery Procedure 3.
Steps 1-10) are present, then the current operation was terminated with
Performed only if Tl04
f
0, an "unusual end
11
due to any of the fol lowing errors:
x
x
Use Recovery Procedure 2.
indicating an "unusual end".
a. Invalid order code issued,
x x x
Use Recovery Procedure 4.
b.
The device's read clock was 1ost during header or data reading.
c.
Receiving a Seek order while the arm is in motion or an incorrect
length was used with the Seek order.
d. Attempting to start the Header Write operation at a sector other
than zero.
Step 12.
Incorrect Len51th. An incorrect length has been detected. Except for
x x
Use Recovery Procedure 4.
the Header and Seek operations, this indication should not be con-
Performed only if TDV 8
f
0 sidered an error (see SIL flag).
(Sigma 5-9) or if OSB l
f
0
x x
Use Recovery Procedure 6.
(Sigma 3), indicating an incorrect
length error.
Step 13. Inconsistent Status Error. Whenever the device-dependent status has
x x x x x x
Use Recovery Procedure 3.
failed to indicate the specific fallure for which the device-dependent
status checking was invoked, it is considered a hardware ma !function.
28 1/0 Faults and Recovery Procedures