Method of and apparatus for controlling disk drive

A method of controlling a disk drive having a disk storage medium, a spindle motor for rotating said disk storage medium, and a head for reading data on said disk storage medium, comprising:

• a first step of detecting at least one of a load of said spindle motor and a load capacity of a power source of said disk drive;
• and
• a second step of selecting one of a first mode for revolving said spindle motor at a comparatively high speed and reading the data on said disk storage medium by said head, and a second mode for revolving said spindle motor at a comparatively low speed and reading the data on said disk storage medium by said head in accordance with a detected result of said first step,
• wherein said second step comprises:
• a step of selecting said second mode when the load capacity is smaller than a predetermined value;
• and
• a step of returning to said first mode corresponding to the fact that the load of said spindle motor is lower than a second predetermined value, or that the load capacity is larger than a third predetermined value, after selecting said second mode.

An apparatus for controlling a disk drive having a disk storage medium, a spindle motor for rotating said disk storage medium, and a head for reading data on said disk storage medium, comprising:

• detecting means for detecting at least one of a load of said spindle motor and a load capacity of a power source of said disk drive;
• and
• a control circuit for selecting one of a first mode for revolving said spindle motor at a comparatively high speed and reading the data on said disk storage medium by said head, and a second mode for revolving said spindle motor at a comparatively low speed and reading the data on said disk storage medium by said head in accordance with a detected result of said detecting means,
• wherein said control circuit selects said second mode when the load capacity is smaller than a predetermined value and returns to said first mode corresponding to the fact that the load of said spindle motor is lower than a second predetermined value, or that the load capacity is larger than a third predetermined value, after selecting said second mode.