Patent ID: 11862202
Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A data storage device comprising:
a disk;
a spindle motor configured to rotate the disk, wherein the spindle motor is powered by a drive voltage generated in response to a host voltage;
a head configured to be actuated over the disk by a head actuator; and
control circuitry comprising at least one isolation field effect transistor (ISOFET) configured to prevent a reverse current from flowing from the drive voltage to the host voltage when the host voltage falls below a threshold, wherein the control circuitry is configured to:
set a turnoff current level at which the at least one ISOFET is directed to turn off to prevent the reverse current from flowing,
determine a drain-source on resistance Rdson of the at least one ISOFET, and
calculate a voltage turnoff threshold at which the at least one ISOFET is turned off from the turnoff current level and the determined Rdson.