Technical information

HGST Ultrastar C15K600 Hard Disk Drive Specification
202
18.13.4.4
APTPL
The APTPL (Active Persist Through Power Loss) is valid only for the Register service action. The drive ignores the
APTPL in other service actions.
The following table shows the relationship between the last valid APTPL value and information held by the drive.
Table 170 APTPL and information held by a drive
Information
held by the drive
The last valid APTPL value
0
1
Registration
all keys are set to 0
retained
Persistent Reservation
all are removed
retained
Generation counter
set to 0
set to 0
18.13.4.5
Generation counter
The drive increments the Generation counter when Register service action or Preempt and Clear service action
complete successfully.