Disk drive logging failure analysis data when performing an emergency unload
A disk drive is disclosed comprising a head actuated over a disk, a spindle motor operable to rotate the disk, and a ramp near an outer periphery of the disk. When an emergency condition is detected, the head is unloaded onto the ramp, and failure analysis data identifying a cause of the emergency condition is logged.
1. A disk drive comprising:
a disk;
a head actuated over the disk;
a spindle motor operable to rotate the disk;
a ramp near an outer periphery of the disk;
control circuitry operable to:
detect an emergency condition;
unload the head onto the ramp in response to the detected emergency condition; and
log failure analysis data identifying a cause of the emergency condition,
wherein the emergency condition comprises a speed of the spindle motor falling below a threshold.
2. The disk drive as recited in claim 1 , wherein the failure analysis data comprises a speed of the spindle motor.
3. A method of operating a disk drive, the disk drive comprising a disk, a head actuated over the disk, a spindle motor operable to rotate the disk, and a ramp near an outer periphery of the disk, the method comprising:
detecting an emergency condition;
unloading the head onto the ramp in response to the detected emergency condition; and
logging failure analysis data identifying a cause of the emergency condition,
wherein the emergency condition comprises a speed of the spindle motor falling below a threshold.
4. The method as recited in claim 3 , wherein the failure analysis data comprises a speed of the spindle motor.
5. A disk drive comprising:
a disk;
a head actuated over the disk;
a spindle motor operable to rotate the disk;
a ramp near an outer periphery of the disk;
control circuitry operable to:
detect an emergency condition;
unload the head onto the ramp in response to the detected emergency condition; and
log failure analysis data identifying a cause of the emergency condition,
wherein:
the control circuitry comprises a power integrated circuit comprising power circuitry operable to generate driving signals applied to the spindle motor; and
the emergency condition comprises at least one of an undervoltage condition and an overvoltage condition of the power integrated circuit.
6. The disk drive as recited in claim 5 , wherein:
the power integrated circuit receives a supply voltage; and
the undervoltage condition comprises an undervoltage of the supply voltage.
7. The disk drive as recited in claim 5 , wherein:
the power integrated circuit comprises a voltage regulator comprising a charge pump; and
the undervoltage condition comprises an undervoltage of an output of the charge pump.
8. A disk drive comprising:
a disk;
a head actuated over the disk;
a spindle motor operable to rotate the disk;
a ramp near an outer periphery of the disk;
control circuitry operable to:
detect an emergency condition;
unload the head onto the ramp in response to the detected emergency condition; and
log failure analysis data identifying a cause of the emergency condition,
wherein:
the control circuitry comprises a power integrated circuit comprising power circuitry operable to generate driving signals applied to the spindle motor; and
the emergency condition comprises a die temperature of the power integrated circuit exceeding a threshold.
9. The disk drive as recited in claim 8 , wherein the power integrated circuit comprises a resistor fabricated on a die operable to detect the die temperature.
10. A method of operating a disk drive, the disk drive comprising a disk, a head actuated over the disk, a spindle motor operable to rotate the disk, and a ramp near an outer periphery of the disk, the method comprising:
detecting an emergency condition;
unloading the head onto the ramp in response to the detected emergency condition; and
logging failure analysis data identifying a cause of the emergency condition,
wherein:
the disk drive comprises a power integrated circuit comprising power circuitry operable to generate driving signals applied to the spindle motor; and
the emergency condition comprises at least one of an undervoltage condition and an overvoltage condition of the power integrated circuit.
11. The method as recited in claim 10 , wherein:
the power integrated circuit receives a supply voltage; and
the undervoltage condition comprises an undervoltage of the supply voltage.
12. The method as recited in claim 10 , wherein:
the power integrated circuit comprises a voltage regulator comprising a charge pump; and
the undervoltage condition comprises an undervoltage of an output of the charge pump.
13. A method of operating a disk drive, the disk drive comprising a disk, a head actuated over the disk, a spindle motor operable to rotate the disk, and a ramp near an outer periphery of the disk, the method comprising:
detecting an emergency condition;
unloading the head onto the ramp in response to the detected emergency condition; and
logging failure analysis data identifying a cause of the emergency condition,
wherein:
the disk drive comprises a power integrated circuit comprising power circuitry operable to generate driving signals applied to the spindle motor; and
the emergency condition comprises a die temperature of the power integrated circuit exceeding a threshold.
14. The method as recited in claim 13 , wherein the power integrated circuit comprises a resistor fabricated on a die operable to detect the die temperature.