Head retracting apparatus, storage device, and head retracting method
View Patent ↗A head retracting apparatus retracts a head on a storage medium upon detecting a fall. A counter-value calculating unit calculates a counter value that changes with an increase of a falling time and an increase of a non-falling time. A retraction determining unit determines whether to retract the head, based on the calculated counter value.
1. A head retracting apparatus that retracts a head on a storage medium upon detecting a fall, the head retracting apparatus comprising:
a counter-value calculating unit that calculates a counter value that changes with an increase of a falling time and an increase of a non-falling time; and
a retraction determining unit that determines whether to retract the head, based on the calculated counter value, wherein
the counter-value calculating unit adds a predetermined value to the counter value with increase of the falling time, and subtracts a predetermined value from the counter value with the increase of the non-falling time.
2. The head retracting apparatus according to claim 1 , further comprising:
a non-falling-time monitoring unit that monitors the non-falling time, wherein
the non-falling-time monitoring unit adds a predetermined value to a non-falling counter value indicating the non-falling time with the increase of the non-falling time, and resets the non-falling counter value to an initial value when the fall is detected.
3. A storage device that retracts a head on a storage medium upon detecting a fall, the storage device comprising:
a counter-value calculating unit that calculates a counter value that changes with an increase of a falling time and an increase of a non-falling time; and
a retraction determining unit that determines whether to retract the head, based on the calculated counter value, wherein
the counter-value calculating unit adds a predetermined value to the counter value with increase of the falling time, and subtracts a predetermined value from the counter value with the increase of the non-falling time.
4. The storage device according to claim 3 , further comprising:
a non-falling-time monitoring unit that monitors the non-falling time, wherein
the non-falling-time monitoring unit adds a predetermined value to a non-falling counter value indicating the non-falling time with the increase of the non-falling time, and resets the non-falling counter value to an initial value when the fall is detected.
5. A head retracting method of retracting a head on a storage medium upon detecting a fall, the head retracting method comprising:
calculating a counter value that changes with an increase of a falling time and an increase of a non-falling time; and
determining whether to retract the head, based on the calculated counter value, wherein:
the calculating includes:
adding a predetermined value to the counter value with increase of the falling time; and
subtracting a predetermined value from the counter value with the increase of the non-falling time.
6. The head retracting method according to claim 5 , further comprising:
monitoring the non-falling time, wherein
the monitoring includes:
adding a predetermined value to a non-falling counter value indicating the non-falling time with the increase of the non-falling time; and
resetting the non-falling counter value to an initial value when the fall is detected.