Intermediate power down mode for a rotatable media data storage device
View Patent ↗The power consumed by a data storage device having at least one disk connected with a spindle can be reduced by reducing the rotation rate of the spindle to a rotation rate greater than zero. In one method in accordance with the present invention, wherein a head is in communication with each disk, the spindle can be rotated at a first rotation rate. The head can be parked and the rotation of the spindle can then be reduced to a rotation rate greater than zero. By reducing the rotation rate of the spindle, the power consumed by the spindle can be reduced by approximately the ratio of spin speeds to the exponential power of 1.5. This description is not intended to be a complete description of, or limit the scope of, the invention. Other features, aspects, and objects of the invention can be obtained from a review of the specification, the figures, and the claims.
1. A method to reduce the power consumed by a data storage device including a disk, a ramp arranged adjacent to the disk, and an actuator having a head adapted to be positioned over the disk, the method comprising:
rotating the disk at a first rotation rate;
positioning the actuator on the ramp;
determining a load time for removing the actuator from the ramp such that the head is positioned over the disk;
determining a second rotation rate such that a time to increase the rotation from the second rotation rate to the first rotation rate is approximately the load time; and
reducing the rotation of the disk to approximately the second rotation rate;
wherein positioning the actuator on the ramp is performed one of prior to and simultaneously with reducing the rotation of the disk to approximately the second rotation rate.
2. The method of claim 1 , wherein the first rotation rate is substantially 5400 RPM.
3. The method of claim 2 , wherein the second rotation rate is substantially 3600 RPM.
4. The method of claim 1 , wherein the first rotation rate is substantially one of 4200 RPM, 7200 RPM, 10000 RPM, and 15000 RPM.
5. A data storage device adapted to perform the method of claim 1 .
6. A method to of reduce the power consumed by a data storage device, the method comprising:
providing a data storage device having a disk, wherein the disk is rotated at a first rotation rate, a ramp arranged adjacent to the disk, an actuator assembly having a head, and a servo system;
receiving a signal to reduce the rotation of the disk;
positioning the actuator assembly on the ramp;
reducing the rotation of the disk to a second rotation rate;
wherein the second rotation rate is such that a time to increase the rotation from the second rotation rate to the first rotation rate is approximately a load time for removing the actuator assembly from the ramp such that the head is positioned over the disk;
receiving a signal to perform an operation; and
increasing the rotation of the disk to the first rotation rate;
removing the actuator assembly from the ramp such that the head is positioned over the disk;
wherein increasing the rotation of the disk to the first rotation rate is performed one of prior to and simultaneously with removing the actuator assembly from the ramp such that the head is positioned over the disk.
7. A method to reduce the power consumed by a data storage device, the method comprising:
providing a data storage device having a disk, wherein the disk is rotating at a first rotation rate, an actuator assembly having a head, wherein the head is adapted to communicate with the disk, and a servo system;
receiving a signal to reduce the rotation rate of the disk;
removing the head from within communication distance of the disk;
reducing the rotation of the disk to a second rotation rate;
wherein the second rotation rate is such that a time to increase the rotation from the second rotation rate to the first rotation rate is approximately a load time for placing the head within communication distance of the disk;
receiving a signal to perform an operation;
increasing the rotation of the disk to the first rotation rate; and
placing the head within communication distance of the disk;
wherein increasing the rotation of the disk to the first rotation rate is performed one of prior to and simultaneously with placing the head within communication distance of the disk.
8. The method of claim 7 , wherein removing the head from within communication distance of the disk further includes positioning the actuator assembly onto a ramp such that the head is adjacent to the disk.
9. The method of claim 7 , wherein removing the head from within communication distance of the disk further includes positioning the actuator assembly such that the head is over an outer portion of the disk.
10. The method of claim 7 , wherein the first rotation rate is substantially 5400 RPM.
11. The method of claim 10 , wherein the second rotation rate is substantially 3600 RPM.
12. A processor having instructions for:
rotating a disk at a first rotation rate, the disk having a head connected with an actuator arm, the head being in close proximity to a surface of the disk;
moving the actuator arm so that the head is removed from close proximity to the surface; and
reducing the rotation of the disk to a second rotation rate;
wherein the second rotation rate is such that a time to increase the rotation from the second rotation rate to the first rotation rate is approximately a load time for placing the head within close proximity of the surface;
wherein close proximity is a distance within which the head communicates with the surface.