Preamp fast head switch technique for servo mode
AssigneeTexas Instruments Incorporated
InventorIndumini W. Ranmuthu
Life of this patent
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Abstract
A differential circuit to read differential data from a disk by a current bias on a plurality of read heads includes a read circuit to read the differential data from the disk by maintaining the current bias. The current is below a maximum current of a read head having the lowest maximum voltage of said plurality of read heads.
Claims6
A differential circuit to read differential data from a disk by a current bias on a plurality of read heads, comprising:
- a read circuit to read said differential data from said disk by maintaining said current bias on said read head by maintaining a single safe current in each of said plurality of heads;
- and
- wherein said safe current is below a maximum current of all said plurality of read heads.
A differential circuit to read differential data from a disk by a current bias on a plurality of read heads, comprising:
- a read circuit to read said differential data from said disk by maintaining said current bias on said read head by maintaining a safe current;
- and
- wherein said safe current is below a maximum current of all said plurality of read heads,
- wherein a head switching time of said read circuit is a less than 500 ns.
A disk system to read information from a disk, comprising:
- a read/write head to read and write information from said disk;
- a read channel to process said information;
- and
- a differential circuit to read differential data from a disk by a current bias on a plurality of read heads during servo write module, comprising:
- a read circuit to read said differential data from said disk by maintaining said current bias on said read head by maintaining a single safe current in each of said plurality of heads;
- and
- wherein said safe current is below a maximum current of all said plurality of read heads in frequency.
A disk system to read information from a disk, comprising:
- a read/write head to read and write information from said disk;
- a read channel to process said information;
- and
- a differential circuit to read differential data from a disk by a current bias on a plurality of read heads during servo write module, comprising:
- a read circuit to read said differential data from said disk by maintaining said current bias on said read head by maintaining a safe current;
- and
- wherein said safe current is below a maximum current of all said plurality of read heads in frequency
- wherein said a switching time of said read circuit is a less than 500 ns.
Dependencies are inferred from the claim text.