Patent ID: 7453221

Claim:
A disk drive system comprising: a rotatable storage medium adapted to store data; a spindle motor disposed to rotate the rotatable storage medium; a control system operating to inductively sense spindown of the spindle motor by executing an inductive sensing cycle through all states, S 1 through S total , of the spindle motor to determine a minimum current rise time value, T min1 , occurring at a spindle motor state, S min1 , and executing a further inductive sensing cycle through all states, S 1 through S total , of the spindle motor to determine a further minimum current rise time value, T min2 , occurring at a spindle motor state S min2 , where the control system executes a braking operation of the spindle motor and re-executes the inductive sensing cycle and further inductive sensing cycle if S min1 is different from S min2 .