초록 ▼

A disk drive is disclosed comprising a head disk assembly (HDA) filled with a gas, the HDA comprising a head actuated over a disk, and an electrical heating element. A pressure inside the HDA is measured, and the electrical heating element is heated for a first heating time. A rate of temperature ch

A disk drive is disclosed comprising a head disk assembly (HDA) filled with a gas, the HDA comprising a head actuated over a disk, and an electrical heating element. A pressure inside the HDA is measured, and the electrical heating element is heated for a first heating time. A rate of temperature change of the electrical heating element is measured, and the gas leaking from the HDA is detected in response to the pressure and the rate of temperature change.

대표청구항 ▼

1. A disk drive comprising: a head disk assembly (HDA) filled with a gas, the HDA comprising: a disk;a head actuated over the disk;an electrical heating element; andcontrol circuitry operable to: measure a pressure inside the HDA;heat the electrical heating element for a first heating time;measure a

1. A disk drive comprising: a head disk assembly (HDA) filled with a gas, the HDA comprising: a disk;a head actuated over the disk;an electrical heating element; andcontrol circuitry operable to: measure a pressure inside the HDA;heat the electrical heating element for a first heating time;measure a rate of temperature change of the electrical heating element; anddetect the gas leaking from the HDA in response to the pressure and the rate of temperature change by: measuring a starting temperature (TEMPs) of the electrical heating element before heating the heating element;measuring an ending temperature (TEMPe) of the electrical heating element after the first heating time;determining a temperature threshold in response to TEMPs and TEMPe;measuring a cooling time required for the temperature of the electrical heating element to cool to the temperature threshold; anddetecting the gas leaking from the HDA in response to the cooling time. 2. The disk drive as recited in claim 1, wherein the rate of temperature change is a rate of cooling. 3. The disk drive as recited in claim 2, wherein the control circuitry is further operable to: measure an ending temperature (TEMPe) of the electrical heating element after the first heating time;wait for a predetermined cooling time after the first heating time;measure a cooled temperature (TEMPc) of the electrical heating element after the cooling time; anddetect the gas leaking from the HDA in response to the TEMPe and the TEMPc. 4. The disk drive as recited in claim 1, wherein the rate of temperature change is a rate of heating. 5. The disk drive as recited in claim 4, wherein the control circuitry is further operable to: measure a first temperature (TEMP1) of the electrical heating element after the first heating time;heat the electrical heating element for a second heating time;measure a second temperature (TEMP2) of the electrical heating element after the second heating time; anddetect the gas leaking from the HDA in response to the TEMP1 and the TEMP2. 6. The disk drive as recited in claim 1, wherein the electrical heating element comprises a thermistor. 7. The disk drive as recited in claim 1, wherein the electrical heating element comprises a diode. 8. The disk drive as recited in claim 1, further comprising a temperature sensor located proximate the electrical heating element. 9. A method of operating a disk drive comprising a head disk assembly (HDA) filled with a gas, the HDA comprising a head actuated over a disk and an electrical heating element, the method comprising: measuring a pressure inside the HDA;heating the electrical heating element for a first heating time;measuring a rate of temperature change of the electrical heating element; anddetecting the gas leaking from the HDA in response to the pressure and the rate of temperature change by: measuring a starting temperature (TEMPs) of the electrical heating element before heating the heating element;measuring an ending temperature (TEMPe) of the electrical heating element after the first heating time;determining a temperature threshold in response to TEMPs and TEMPe;measuring a cooling time required for the temperature of the electrical heating element to cool to the temperature threshold; anddetecting the gas leaking from the HDA in response to the cooling time. 10. The method as recited in claim 9, wherein the rate of temperature change is a rate of cooling. 11. The method as recited in claim 10, further comprising: measuring an ending temperature (TEMPe) of the electrical heating element after the first heating time;waiting for a predetermined cooling time after the first heating time;measuring a cooled temperature (TEMPc) of the electrical heating element after the cooling time; anddetecting the gas leaking from the HDA in response to the TEMPe and the TEMPc. 12. The method as recited in claim 9, wherein the rate of temperature change is a rate of heating. 13. The method as recited in claim 12, further comprising: measuring a first temperature (TEMP1) of the electrical heating element after the first heating time;heating the electrical heating element for a second heating time;measuring a second temperature (TEMP2) of the electrical heating element after the second heating time; anddetecting the gas leaking from the HDA in response to the TEMP1 and the TEMP2. 14. The method as recited in claim 9, wherein the electrical heating element comprises a thermistor. 15. The method as recited in claim 9, wherein the electrical heating element comprises a diode. 16. The method as recited in claim 9, further comprising measuring a temperature proximate the electrical heating element. 17. A disk drive comprising: a head disk assembly (HDA) filled with a gas, the HDA comprising: a disk;a head actuated over the disk;an electrical heating element; andcontrol circuitry operable to: measure a pressure inside the HDA;heat the electrical heating element for a first heating time;measure a rate of temperature change of the electrical heating element; anddetect the gas leaking from the HDA in response to the pressure and the rate of temperature change by: measuring a first temperature (TEMP1) of the electrical heating element after the first heating time;heating the electrical heating element for a second heating time;measuring a second temperature (TEMP2) of the electrical heating element after the second heating time; anddetecting the gas leaking from the HDA in response to the TEMP1 and the TEMP2. 18. A method of operating a disk drive comprising a head disk assembly (HDA) filled with a gas, the HDA comprising a head actuated over a disk and an electrical heating element, the method comprising: measuring a pressure inside the HDA;heating the electrical heating element for a first heating time;measuring a rate of temperature change of the electrical heating element; anddetecting the gas leaking from the HDA in response to the pressure and the rate of temperature change by: measuring a first temperature (TEMP1) of the electrical heating element after the first heating time;heating the electrical heating element for a second heating time;measuring a second temperature (TEMP2) of the electrical heating element after the second heating time; anddetecting the gas leaking from the HDA in response to the TEMP1 and the TEMP2.