Method and apparatus for dynamically establishing roll static attitude in hard disk drive
View Patent ↗A hard disk drive establishes a roll static attitude (RSA) of a slider during operation to be zero during normal operation and to be non-zero during load/unload from a ramp. Specifically, a RSA bias mechanism such as a piezoelectric layer can be coupled to the slider suspension to bend the flexure of the suspension during load/unload so that the slider inner edge is higher than the outer edge. Consequently, any slider-disk contact that occurs during load/unload will be at the outer edge of the slider, where data is not expected to be on the disk.
1. A hard disk drive, comprising:
at least one rotatable disk;
at least one slider juxtaposed with the disk;
a suspension holding the slider;
a roil static attitude (RSA) bias mechanism coupled to the suspension to establish a RSA of the slider:
a HDD controller executing a program to actuate the RSA bias mechanism to establish a zero RSA during read and write operations and to otherwise establish a non-zero RSA during ramp load and unload operations.
2. The disk drive of claim 1 , wherein the RSA bias mechanism includes at least one piezoelectric structure bonded to the suspension.
3. The disk drive of claim 1 , wherein the RSA is implemented by actuating the RSA bias mechanism to bend a flexure of the suspension to cause an inner edge of the slider to be higher relative to the disk than an outer edge of the slider during load and unload operations.
4. A bard disk drive (HDD) comprising:
at least one slider;
at least one roll static attitude (RSA) bias mechanism coupled to the slider to turn the slider; and
at least one controller actuating the RSA bias mechanism to establish a RSA based on making a determination whether the slider is being loaded/unloaded or is in data communication with the disk.
5. The HDD of claim 4 , wherein a non-zero RSA is implemented by actuating the RSA bias mechanism to bend a flexure associated with the slider to cause an inner edge of the slider to be higher relative to a data storage surface than an outer edge of the slider when it is determined that the slider is being loaded/unloaded.
6. The disk drive of claim 4 , wherein the RSA bias mechanism includes at least one piezoclectric structure bonded to a suspension associated with the slider.
7. A data storage device, comprising:
data storage means for storing data;
data transfer means juxtaposed with the data storage means for communicating data therebetween;
roll static attitude (RSA) biasing means for establishing a RSA of the data transfer means; and
logic means for actuating the RSA biasing means to establish a RSA of the data transfer means depending on whether or not the data transfer means is being loaded/unloaded, the logic means being programmed to establish a non-zero RSA wherein an inner edge of the data transfer means is higher relative to the data storage means than is an outer edge of the data transfer means during load/unload, the logic means being programmed to establish a zero RSA of the data transfer means when the data transfer means is communicating with the data storage means.
8. The data storage device of claim 7 , wherein the RSA biasing means is established at least in part by a piezoelectric element.