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Disk Media Management
414 C141-C013
d. Number of remaining alternate sectors
The HDD monitors the number of remaining alternate sectors. If the number
of spare sectors that can be allocated as alternatives drops below the
threshold for a physical reason or due to the size of a control table within the
HDD, the HDD considers that a failure prediction reporting condition has
developed.
Threshold 200 spare sectors
e. Spin-up time
The HDD monitors the spin-up time. Monitoring begins when a motor
startup sequence is initiated at power-on or when the disk is explicitly started
by the START UNIT command. At each spin-up run, the HDD compares
both the current and previous spin-up times with the threshold. If the
threshold is exceeded, the HDD considers that a failure prediction reporting
condition has developed.
Threshold 55 seconds
f. G-list update frequency
The HDD monitors the number of G-list updates due to automatic alternate
processing that is performed during read processing, in relation to the number
of sectors contained in the sample as indicated in Item a. above. The number
of G-list updates counted does not include those that are involved in alternate
processing performed by the REASSIGN BLOCKS command. If the number
of updates reaches the threshold, the HDD considers that a failure prediction
reporting condition has developed.
Threshold 300 updates
g. Cumulative power-on time
The HDD maintains the run time that has elapsed since it was shipped.
However, there is no failure prediction based on this value.
Threshold 45,000 hours