Head slap detecting device, storage device, head slap detecting method, and computer product
View Patent ↗A head-slap detecting device detects a head slap. The head slap causes a storage medium to be slapped by at least one storage-medium driving unit that performs at least one of reproduction and recording of data from and to the storage medium. The head-slap detecting device includes a detecting unit that detects the head slap by determining whether a first variable gain obtained from a variable gain amplifier that amplifies an output of data reproduced by the storage-medium driving unit exceeds a predetermined threshold.
1. A head-slap detecting device that detects a head slap that causes a storage medium to be slapped by at least one storage-medium driving unit that performs at least one of reproduction and recording of data from and to the storage medium, the head-slap detecting device comprising:
a detecting unit that detects whether a head slap has occurred based on whether a first variable gain obtained from a variable gain amplifier that amplifies an output of data reproduced by the storage medium driving unit exceeds a first threshold.
2. The head-slap detecting device according to claim 1 , further comprising a storing unit that stores therein information related to the head slap when the detecting unit detects the head slap.
3. The head-slap detecting device according to claim 1 , wherein the detecting unit detects whether the head slap has occurred based on whether a second variable gain obtained by amplifying an output of servo control data through the variable gain amplifier exceeds a second threshold.
4. The head-slap detecting device according to claim 1 , wherein the detecting unit determines whether the first variable gain exceeds the first threshold when a shock sensor that detects vibration occurred in the storage-medium driving unit detects the vibration.
5. The head-slap detecting device according to claim 1 , wherein the detecting unit detects whether the head slap has occurred based on whether a third variable gain exceeds a third threshold, wherein the third variable gain is an average of gains obtained by amplifying outputs of plural pieces of data reproduced during a predetermined time through the variable gain amplifier.
6. The head-slap detecting device according to claim 1 , wherein the detecting unit detects whether the head slap has occurred based on whether a fourth variable gain obtained by subtracting a gain of a predetermined frequency band from the first variable gain exceeds a fourth threshold.
7. The head-slap detecting device according to claim 1 , wherein the detecting unit detects whether the head slap has occurred based on whether the first variable gain exceeds a threshold set for each of the storage-medium driving unit.
8. The head-slap detecting device according to claim 1 , further comprising an acquiring unit that acquires temperature information indicative of temperature of the storage-medium driving unit, wherein
the detecting unit detects whether the head slap has occurred based on whether the first variable gain exceeds a threshold corresponding to the temperature information acquired by the acquiring unit.
9. A storage device including at least one storage-medium driving unit that performs at least one of reproduction and recording of data from and to a storage medium, the storage device comprising:
a detecting unit that detects whether a head slap has occurred based on whether a first variable gain obtained from a variable gain amplifier that amplifies an output of data reproduced by the storage medium driving unit exceeds a first threshold.
10. The storage device according to claim 9 , further comprising a storing unit that stores therein information related to the head slap when the detecting unit detects the head slap.
11. The storage device according to claim 9 , wherein the detecting unit detects whether the head slap has occurred based on whether a second variable gain obtained by amplifying an output of servo control data through the variable gain amplifier exceeds a second threshold.
12. The storage device according to claim 9 , wherein the detecting unit determines whether the first variable gain exceeds the first threshold when a shock sensor that detects vibration occurred in the storage-medium driving unit detects the vibration.
13. The storage device according to claim 9 , wherein the detecting unit detects whether the head slap has occurred based on whether a third variable gain exceeds a third threshold, wherein the third variable gain is an average of gains obtained by amplifying outputs of plural pieces of data reproduced during a predetermined time through the variable gain amplifier.
14. The storage device according to claim 9 , wherein the detecting unit detects whether the head slap has occurred based on whether a fourth variable gain obtained by subtracting a gain of a predetermined frequency band from the first variable gain exceeds a fourth threshold.
15. The storage device according to claim 9 , wherein the detecting unit detects whether the head slap has occurred based on whether the first variable gain exceeds a threshold set for each of the storage-medium driving unit.
16. The storage device according to claim 9 , further comprising an acquiring unit that acquires temperature information indicative of temperature of the storage-medium driving unit, wherein
the detecting unit detects whether the head slap has occurred based on whether the first variable gain exceeds a threshold corresponding to the temperature information acquired by the acquiring unit.
17. A head-slap detecting method of detecting a head slap that causes a storage medium to be slapped by at least one storage-medium driving unit that performs at least one of reproduction and recording of data from and to the storage medium, the head-slap detecting method including:
detecting whether a head slap has occurred based on whether a variable gain obtained from a variable gain amplifier that amplifies an output of the data reproduced by the storage-medium driving unit exceeds a predetermined threshold.
18. A computer-readable recording medium that stores therein a computer program that causes a computer to detect a head slap that causes a storage medium to be slapped by at least one storage-medium driving unit that performs at least one of reproduction and recording of data from and to the storage medium, the computer program causing the computer to execute:
detecting whether a head slap has occurred based on whether a variable gain obtained from a variable gain amplifier that amplifies an output of the data reproduced by the storage-medium driving unit exceeds a predetermined threshold.