Control apparatus, storage device, and head retracting method
View Patent ↗A sample-information extracting unit acquires a fall signal indicating whether a storage device is falling, conducts a sampling in response to the fall signal, and sequentially extracts sample information including either one of first information indicating a falling state and second information indicating a non-falling state. A retraction determining unit determines whether to retract the head, based on features of an array of the extracted sample information.
1. A control apparatus for a storage device that retracts a head on a storage medium upon detecting a fall, the control apparatus comprising:
a sample-information extracting unit that acquires a fall signal indicating whether the storage device is falling, conducts a sampling of the fall signal, and sequentially extracts sample information including either one of first information indicating a falling state and second information indicating a non-falling state; and
a retraction determining unit that determines whether to retract the head, based on features of an array of the extracted sample information.
2. The control apparatus according to claim 1 , wherein
the retraction determining unit determines to retract the head when number of pieces of the sample information including the first information is greater than a predetermined threshold, excluding sample information that changes from the second information to the first information.
3. The control apparatus according to claim 1 , wherein
the retraction determining unit determines to retract the head when an extraction period of the sample information including the first information is greater than a predetermined threshold, excluding sample information that changes from the second information to the first information.
4. The control apparatus according to claim 1 , wherein
the retraction determining unit determines to retract the head when number of pieces of the sample information including the first information is greater than a predetermined threshold, excluding sample information that changes from the first information to the second information.
5. The control apparatus according to claim 1 , wherein
the retraction determining unit determines to retract the head when an extraction period of the sample information including the first information is greater than a predetermined threshold, excluding sample information that changes from the first information to the second information.
6. The control apparatus according to claim 1 , wherein
the retraction determining unit determines to retract the head when number of pieces of the sample information including the first information is greater than a predetermined threshold, excluding sample information that changes in order of the first information, the second information, and the first information.
7. The control apparatus according to claim 1 , wherein
the retraction determining unit determines to retract the head when an extraction period of the sample information including the first information is greater than a predetermined threshold, excluding sample information that changes in order of the first information, the second information, and the first information.
8. The control apparatus according to claim 1 , further comprising
a changing unit that changes a timing of sampling of the fall signal when the extracted sampling information includes the first information for a predetermined number of times successively.
9. A storage device that retracts a head on a storage medium upon detecting a fall, the storage device comprising:
a sample-information extracting unit that acquires a fall signal indicating whether the storage device is falling, conducts a sampling of the fall signal, and sequentially extracts sample information including either one of first information indicating a falling state and second information indicating a non-falling state; and
a retraction determining unit that determines whether to retract the head, based on features of an array of the extracted sample information.
10. The storage device according to claim 9 , wherein
the retraction determining unit determines to retract the head when number of pieces of the sample information including the first information is greater than a predetermined threshold, excluding sample information that changes from the second information to the first information.
11. The storage device according to claim 9 , wherein
the retraction determining unit determines to retract the head when an extraction period of the sample information including the first information is greater than a predetermined threshold, excluding sample information that changes from the second information to the first information.
12. The storage device according to claim 9 , wherein
the retraction determining unit determines to retract the head when number of pieces of the sample information including the first information is greater than a predetermined threshold, excluding sample information that changes from the first information to the second information.
13. The storage device according to claim 9 , wherein
the retraction determining unit determines to retract the head when an extraction period of the sample information including the first information is greater than a predetermined threshold, excluding sample information that changes from the first information to the second information.
14. The storage device according to claim 9 , wherein
the retraction determining unit determines to retract the head when number of pieces of the sample information including the first information is greater than a predetermined threshold, excluding sample information that changes in order of the first information, the second information, and the first information.
15. The storage device according to claim 9 , wherein
the retraction determining unit determines to retract the head when an extraction period of the sample information including the first information is greater than a predetermined threshold, excluding sample information that changes in order of the first information, the second information, and the first information.
16. The storage device according to claim 9 , further comprising
a changing unit that changes a timing of sampling of the fall signal when the extracted sampling information includes the first information for a predetermined number of times successively.
17. A head retracting method of retracting a head from a storage medium by detecting a fall of a storage device, the head retracting method comprising:
sample-information extracting including
acquiring a fall signal indicating whether the storage device is falling;
conducting a sampling of the fall signal; and
extracting sequentially sample information including either one of first information indicating a falling state and second information indicating a non-falling state; and
determining whether to retract the head, based on features of an array of the extracted sample information.
18. The head retracting method according to claim 17 , wherein
the determining includes determining to retract the head when number of pieces of the sample information including the first information is greater than a predetermined threshold, excluding sample information that changes from the second information to the first information.
19. The head retracting method according to claim 17 , wherein
the determining includes determining to retract the head when an extraction period of the sample information including the first information is greater than a predetermined threshold, excluding sample information that changes from the second information to the first information.
20. The head retracting method according to claim 17 , further comprising
changing a timing of sampling of the fall signal when the extracted sampling information includes the first information for a predetermined number of times successively.