Tandberg Data
Log Sense
13-49
Tandberg SLR Product Line SCSI Functional Specifications
Write Servo Lock Lost Log Parameters
BYTE
BIT 7
6
5
4
3
2
1
0
n+0
n+1
Parameter Code = 0002h
n+2
DU
DS
TSD
ETC
TMC
R
LP
n+3
Parameter Length = 02h
n+4
n+5
Write Servo Lock Lost Counter
Table 13-46: Write Servo Lock Lost Counter Log Parameters
Parameter Code
The Parameter Code is set to 0002h.
DU
A Disable Update (DU) bit set to 0 indicates that the
Drive is free to update the counter.
A DU bit set to 1 indicates that the Drive shall not
update the counter except in response to a LOG SELECT
command that specifies a new value for the counter.
The initiator may use the LOG SELECT command to set or
clear the DU bit.
The Drive will set the DU bit to 1 when the counter
reaches its maximum value (FFFFh).
DS
The Disable Save (DS) bit is set to 1 to indicate that
the Drive does not support saving of this log parameter.
(Note: This bit can not be changed by the initiator)
TSD
The Target Save Disable (TSD) bit is set to 1 to
indicate that the Drive does not provide any Drive-
defined method for saving of this log parameter.
(Note: This bit can not be changed by the initiator)
ETC
An Enable Threshold Comparison (ETC) bit indicates
whether comparison to the threshold value is performed
or not.
The default value is 0. See the LOG SELECT command for
further description.
TMC
The Threshold Met Criteria (TMC) field is valid only if
ETC bit is 1 and it selects one of four possible
Threshold Met Criteria.
The default value is 11b. See the LOG SELECT command for
further description.
LP
The List Parameters (LP) bit is set to 0 to indicate
that the parameter is a data counter.
(Note: This bit can not be changed by the initiator)
Parameter Length
This field is set to 02h.
Write Servo Lock
Lost Counter
The Servo Lock Lost Counter is incremented when the head
servo has lost servo lock during write operation. The
servo lock is considered to be lost if the tracking
error exceeds allowed maximum value (This can for
example happen, when the Drive is exposed to an external
mechanical shock).
