Data storage device pre-biasing write current for energy assisted magnetic recording
AssigneeWestern Digital Technologies, Inc.
InventorsJoey M. Poss, Naoto Ito, Phillip S. Haralson
Life of this patent
Estimating the term…
Abstract
A data storage device is disclosed comprising a head actuated over an energy assisted magnetic media comprising a plurality of data tracks, wherein each data track comprises a plurality of data sectors. A write operation to a first data sector is executed by applying a first current to a write coil of the head while the head is over a second data sector preceding the first data sector, wherein the first current comprises a first amplitude. A second current is applied to the write coil while the head is over the first data sector, wherein the second current comprises a second amplitude lower than the first amplitude.
Claims20
A preamp circuit comprising:
- a write amplifier configured to generate a write current for a write coil of a head;
- an interface configured to receive a write signal;
- an oscillator configured to generate an oscillating signal;
- and
- write control logic configured to:
- during a pre-bias interval, configure the write amplifier with a first gain and apply the oscillating signal to the write amplifier;
- and
- during a write interval, configure the write amplifier with a second gain lower than the first gain and apply the write signal to the write amplifier.
Dependencies are inferred from the claim text.