Disc drive fine servo velocity control and method for head positioning relative to a disc

Claim 2

A fine servo velocity control for a disc drive capable of mounting a disc, defining a plurality of data tracks and having a read/write head for transferring data to and from the disc, the fine servo velocity control comprising: servo velocity control means for seeking to a destination data track and for placing the head approximately on a destination data track; servo position control means for locating a centerline of a destination data track and for placing the head about on the centerline of the destination track; fine servo velocity control means for selectively providing servo information generated by the servo position control means to the servo velocity control means, to assist in track seeking, as said servo velocity control means causes the head to approach and reach the destination data track to enable the head to more quickly and smoothly settle on the destination track; and means for enabling said fine servo velocity control means to provide servo information to the servo velocity control means when said servo velocity control means determines the head is a preselected distance from a destination data track.

Claim 3

The apparatus of claim 1 wherein: said servo velocity control means includes digital circuitry means for receiving servo information stored on the disc; said servo position control means includes analog circuity means for receiving servo information stored on the disc; and said fine servo velocity control means includes an analog to digital conversion means for communicating the servo information received by the analog circuitry means to the digital circuitry means.

Claim 4

The apparatus of claim 1 including: servo information stored in servo data patterns on tracks of the disc; said servo information including a representation of the number assigned to each track and centerline centering information; said servo velocity control means including means for receiving the representation of the number assigned to each track; and said servo position control means including means for receiving the centerline centering information.

Claim 5

The apparatus of claim 1 wherein: said servo position control means includes: (a) sample and hold means for sampling and holding track centerline centering servo information; (b) means for generating a position error signal from the centerline centering servo information sampled by the sample and hold means; and said fine servo velocity control means includes means for communicating said position error signal to said servo velocity control means.

Claim 6

A fine servo velocity control for a disc drive capable of mounting a disc, defining a plurality of data tracks and having a read/write head for transferring data to and from the disc, the fine servo velocity control comprising: servo velocity control means for seeking to a destination track and for placing the head approximately on a destination track; servo position control means for locating a centerline of a destination track and for placing the head about on the centerline of the destination track; fine servo velocity control means for selectively providing servo information generated by the servo position control means to the servo velocity control means to assist in track seeking, as said servo velocity control means, causes the head to approach the destination track to enable the head to more quickly and smoothly settle on the destination track; means for disabling the servo velocity control means should the servo velocity control means malfunction; wherein said velocity control means includes a microprocessor means adapted for sending a seek signal; and wherein said disabling means including a means for receiving a pulse from the microprocessor and means for disabling the seek signal should the microprocessor not send said pulse to said disabling means.

Claim 7

A fine servo velocity control for a disc drive capable of mounting a disc, defining a plurality of data tracks and having a read/write head for transferring data to and from the disc, the fine servo velocity control comprising: servo velocity control means for seeking to a destination track and for placing the head approximately on a destination track; servo position control means for locating a centerline of a destination track and for placing the head about on the centerline of the destination track; fine servo velocity control means for selectively providing servo information generated by the servo position control means to the servo velocity control means to assist in track seeking, as said servo velocity control means, causes the head to approach the destination track to enable the head to more quickly and smoothly settle on the destination track; means for disabling the servo velocity control means should the servo velocity control means malfunction; wherein said velocity control means includes a microprocessor means adapted for sending a seek signal; and wherein said disabling means including a means for receiving a pulse from the microprocessor and means for disabling the seek signal should the microprocessor not send said pulse to said disabling means.

Claim 8

The apparatus of claim 5 wherein: said disabling means includes a one-shot multivibrator.

Claim 9

A fine servo velocity control for a disc drive capable of mounting a disc, defining a plurality of data tracks, and having a read/write head for transferring data to and from the disc, the fine servo velocity control comprising: servo velocity control means for seeking to a destination track and for placing the head approximately on a destination track; servo position control means for locating a centerline of a destination track and for placing the head about on the centerline of the destination track; servo information stored in servo data patterns on tracks of the disc; said servo information including a representation of the number assigned to each track and centerline centering information; said servo velocity control means including means for receiving the representation of the number assigned to each track, to assist in track seeking; and said servo position control means including means for receiving the centerline centering information; fine velocity control means for selectively providing servo information generated by the servo position control means to the servo velocity control means, to assist in track seeking, as said servo velocity control means causes the head to approach the destination track to enable the head to more quickly and smoothly settle on the destination track; and wherein said servo velocity control means includes means for determining when the head is a preselected distance from a destination track and for enabling said fine velocity control means when said servo velocity control means determines the head is a preselected distance from a destination track.

Claim 10

A fine servo velocity control for a disc drive capable of mounting a disc, defining a plurality of data tracks, and having a read/write head for transferring data to and from the disc, the fine servo velocity control comprising: servo velocity control means for seeking to a destination track and for placing the head approximately on a destination track; servo position control means for locating a centerline of a destination track and for placing the head about on the centerline of the destination track; servo information stored in servo data patterns on tracks of the disc; said servo information including a representation of the number assigned to each track and centerline centering information; said servo velocity control means including means for receiving the representation of the number assigned to each track, to assist in track seeking; and said servo position control means including means for receiving the centerline centering information; fine velocity control means for selectively providing servo information generated by the servo position control means to the servo velocity control means, to assist in track seeking, as said servo velocity control means causes the head to approach the destination track to enable the head to more quickly and smoothly settle on the destination track; and wherein said servo velocity control means includes means for determining when the head is a preselected distance from a destination track and for enabling said fine velocity control means when said servo velocity control means determines the head is a preselected distance from a destination track.

Claim 11

The apparatus of claim 7 wherein: said servo velocity control means includes digital circuitry means for receiving servo information stored on the disc; said servo position control means includes analog circuitry means for receiving servo information stored on the disc; and said fine velocity control means includes an analog to digital conversion means for communicating the servo information received by the analog circuitry means to the digital circuitry means.

Claim 12

The apparatus of claim 7 wherein: said servo position control means includes: (a) sample and hold means for sampling and holding track centerline centering servo information; (b) means for generating a position error signal from the centerline centering servo information sampled by the sample and hold means; and said fine velocity control means includes means for communicating said position error signal to said servo velocity control means.

Claim 15

The method of claim 10 wherein said step of providing for the communication of centerline centering information includes: providing the centerline centering information to the servo velocity control a preselected number of tracks before the head reaches the destination track.

Claim 16

The method of claim 10 including the step of: providing for the disablement of the servo velocity control should the servo velocity control malfunction.

Claim 17

A disc drive adapted for receiving a disc which defines a plurality of data tracks comprising: means adapted for mounting a disc; a read/write head means for transferring data to and from the disc; and a fine servo velocity control comprising: (a) servo velocity control means for seeking to a destination data track and for placing the head approximately on a destination data track; (b) servo position control means for locating a centerline of a destination data track and for placing the head about on the centerline of the destination data track; (c) fine servo velocity control means for selectively providing servo information generated by the servo position control means to the servo velocity control means, to assist in track seeking, as said servo velocity control means causes the head to approach and reach the destination data track to enable the head to more quickly and smoothly settle on the destination data track; (d) means for enabling said fine servo velocity control means to provide servo information to the servo velocity control means when said servo velocity control means determines the head is a preselected distance from a destination track.

Claim 18

A disc drive adapted for receiving a disc which defines a plurality of data tracks comprising: means adapted for mounting a disc; a read/write head means for transferring data to and from the disc; and a fine servo velocity control comprising: (a) servo velocity control means for seeking to a destination data track and for placing the head approximately on a destination data track; (b) servo position control means for locating a centerline of a destination data track and for placing the head about on the centerline of the destination data track; (c) fine servo velocity control means for selectively providing servo information generated by the servo position control means to the servo velocity control means, to assist in track seeking, as said servo velocity control means causes the head to approach and reach the destination data track to enable the head to more quickly and smoothly settle on the destination data track; (d) means for enabling said fine servo velocity control means to provide servo information to the servo velocity control means when said servo velocity control means determines the head is a preselected distance from a destination track.

Claim 19

A fine servo velocity control for a disc drive capable of mounting a disc, defining a plurality of data tracks, and having a read/write head for transferring data to and from the disc, the fine servo velocity control comprising: servo velocity control means for seeking to a destination track and for placing the head approximately on a destination track; servo position control means for locating a centerline of a destination track and for placing the head about on the centerline of the destination track; servo information stored in servo data patterns on tracks of the disc; said servo information including a representation of the number assigned to each track and centerline centering information; said servo velocity control means including means for receiving the representation of the number assigned to each track; said servo position control means including means for receiving the centerline centering information; and fine velocity control means for selectively providing servo information generated by the servo position control means to the servo velocity control means, to assist in track seeking, as said servo velocity control means causes the head to approach the destination track to enable the head to more quickly and smoothly settle on the destination track.

Claim 20

A fine servo velocity control for a disc drive capable of mounting a disc, defining a plurality of data tracks, and having a read/write head for transferring data to and from the disc, the fine servo velocity control comprising: servo velocity control means for seeking to a destination track and for placing the head approximately on a destination track; servo position control means for locating a centerline of a destination track and for placing the head about on the centerline of the destination track; servo information stored in servo data patterns on tracks of the disc; said servo information including a representation of the number assigned to each track and centerline centering information; said servo velocity control means including means for receiving the representation of the number assigned to each track; said servo position control means including means for receiving the centerline centering information; and fine velocity control means for selectively providing servo information generated by the servo position control means to the servo velocity control means, to assist in track seeking, as said servo velocity control means causes the head to approach the destination track to enable the head to more quickly and smoothly settle on the destination track.

Claim 23

A disc drive adapted for receiving a disc which defines a plurality of data tracks and which has servo information stored in servo data patterns on the data tracks of the disc, the servo information including a representation of the number assigned to each track and centerline centering information, comprising: means adapted for mounting a disc; a read/write head means for transferring data to and from the disc; and a fine servo velocity control comprising: (a) servo velocity control means for seeking to a destination track and for placing the head approximately on a destination track; (b) servo position control means for locating a centerline of a destination track and for placing the head about on the centerline of the destination track; (c) said servo velocity control means including means for receiving the representation of the number assigned to each track; (d) said servo position control means including means for receiving the centerline centering information; and (e) fine servo velocity control means for selectively providing servo information generated by the servo position control means to the servo velocity control means, to assist in track seeking, as said servo velocity control means causes the head to approach the destination track to enable the head to more quickly and smoothly settle on the destination track.

Claim 24

A disc drive adapted for receiving a disc which defines a plurality of data tracks and which has servo information stored in servo data patterns on the data tracks of the disc, the servo information including a representation of the number assigned to each track and centerline centering information, comprising: means adapted for mounting a disc; a read/write head means for transferring data to and from the disc; and a fine servo velocity control comprising: (a) servo velocity control means for seeking to a destination track and for placing the head approximately on a destination track; (b) servo position control means for locating a centerline of a destination track and for placing the head about on the centerline of the destination track; (c) said servo velocity control means including means for receiving the representation of the number assigned to each track; (d) said servo position control means including means for receiving the centerline centering information; and (e) fine servo velocity control means for selectively providing servo information generated by the servo position control means to the servo velocity control means, to assist in track seeking, as said servo velocity control means causes the head to approach the destination track to enable the head to more quickly and smoothly settle on the destination track.