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US 9,741,363 B2Granted
Laser power optimization for heat assisted interlaced magnetic recording
AssigneeSeagate Technology LLC
InventorsMinjie Ma, Kaizhong Gao, Edward Gage, Tim Rausch
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Abstract
A storage device disclosed herein stores data on a storage media using interlaced magnetic recording (IMR) and it includes a storage controller configured to determine power levels applied to the power source such that power levels applied to heat various tracks can be different from each other. An implementation of the storage device determines the track density, linear densities and power levels for even and odd tracks in IMR HAMR for the storage media.
Claims20
A storage device comprising:
- a storage media configured to store data using interlaced magnetic recording (IMR) having at least two different track densities (kilotracks per inch (ktpi));
- a power source configured to heat the storage media;
- and
- a storage device controller configured to determine power levels applied to the power source such that power levels applied to heat various tracks j of different track densities ktpij are different from each other by:
- writing triple adjacent tracks at a given linear density and a given track density;
- determining an optimized power level for the given track density based on an observed best center track bit error rate (BER) of the triple adjacent tracks.
3 more elements
A method comprising:
- determining laser power levels applied to a laser power source of a storage device storing data on storage media using interlaced storage recording (IMR) such that laser power levels applied to heat various tracks can be different from each other;
- by:
- writing triple adjacent tracks at a given linear density and a given track density;
- and
- determining an optimized power level for each of a plurality of track densities based on observed best center track bit error rate (BER) of the triple adjacent tracks.
2 more elements
Dependencies are inferred from the claim text.